Okay, so this was meant to be a question to WLers but grew into a discussion with plenty of ideas thrown around, so I'll add my own opinion about everything that was said.
MPQ
This one is a hard no. Such system favours people with more popular taste and incentivizes scorewhoring. That is completely against the spirit of NSC. Occasionally we have a member threatening to withdraw over poor results and we always do our best to make sure they feel welcome, regardless if their choice of entry is a popular banger or something niche. Letting people in based on their results is, let me repeat, completely against the spirit of NSC.
Collective WL entry
I... don't see what that would achieve? Would WLers feel represented in the contest by this nameless entity? Especially if they don't like the song selected. Maybe whoever chose the song would feel represented, but then that's just like MPQ.
Filling the spots up to 60
If WL people don't mind patchy history and constant uncertainty if they get in or not, then fine. But we would have to reduce the roster first, to around 54! An important detail is missing here, that the limit of 60 was agreed on knowing that a few nations would be missing from each edition. 60 was thought of as the absolute maximum capacity, not the comfortable optimum. I think many agree that they prefer slightly smaller editions. They semis are more manageable to listen to and, let's not forget, to host. Having just finished hosting, I assure you that preparing a show for 58 participants is strenuous enough as it is, especially when you're trying to be creative and make each banner unique. I was already pushing the limits of my remaining three brain cells and if I were to make just two more banners, I'd lose my sanity.
Rotational WL spot
Yeah, well, you'd get to enter once in 2 years... Valentina gets to participate in ESC more often that that.
Make WL voting non-mandatory
Yes, I definitely can understand the argument here. WL voting was different when you only had to do it like 3-5 times before joining and your votes had visible impact, and different now. Obviously, there has to be some activity required from WLers, otherwise someone could sign up and go offline for a year and WL would overflow with ghost users. Only requiring voting from top of the WL doesn't solve that problem. Making WLSC mandatory doesn't sound fair to people who aren't interested in it. I think a fair solution would be if people could choose either to vote in NSC final or participate in WLSC. Of course that requires some time coordination between NSC and WLSC, but I don't think it's impossible to manage.
Make WL votes count as full nations
No, it would be bonkers if final results could suddenly be decided by any random person who signed up 5 minutes ago. Top 3-5 WL nations voting as full nations sounds somewhat more reasonable, but only because WL is pretty long atm and these nations have been on it for a long time. WL will shrink eventually, if not this year, then next year or the year after. I advise against designing solutions with only present-day state in mind.
Minimum post count etc.
I don't think post count is a good indication of your eagerness to take part in NSC. But in general it's one possible approach to making WL shorter: make it more difficult to apply. Currently you only need to provide a nation name and a flag. Perhaps we could require more from a new applicant, like opening a nation thread, making a Wikia nation page, and choosing a spot on the map. Nothing unreasonable, but some basic display of interest, to weed out the most apathetic people.
Harsher non-voting punishments for full roster nations
Okay, although I voted for the last rule amendment regarding non-voting punishments, I think we totally blew it. The initial proposition was something along the lines of "you're out if you ftv 3 times in the last 10 editions" (hence the evil dots name). In the end the "ftv in 3 consecutive finals" option won, because some people were worried the initial proposition would be too confusing or something...I'd gladly revise that rule and introduce evil dots as they were meant to be. Having said that, I do not expect it to have any noticeable effect on roster turnover rate. We don't have a problem with habitual non-voters at the moment, so it bears no meaning for the WL issue right now.
Amnesty for returning members
It's just... not fair? And creates a caste of Old Farts™. I could give it a thought if it really would have the desired effect of much faster turnover rate. But I doubt it. Are there really that many people reluctant to leave the contest only because of WL length?
Mandatory WL semi voting
Given how people are starting to voice displeasure with having to vote in the finals, it's probably a step in the wrong direction. Or maybe not? Maybe we should actually try to integrate WL more with NSC proper, rather than the opposite? People are complaining that their votes bear no weight, but note that WL nations rarely vote in reju, despite their vote being equal to full nations there! This edition Joseyeon was the only WL nation to reju vote in the semis and Pyreica actually qualified thanks to their vote!
Maybe not mandatory semi voting, but maybe those who reju vote regularly deserve at least some small reward.
No WL at all
That's hiding the problem, not solving it.
Expand the roster to 64
I still remember this idea being put to discussion years ago, because it's literally the most ridiculous proposition to ever be seriously suggested in NSC. It's so utterly pointless, I refuse to discuss it.
I'd also like to address the accusation "You're just nay-sayers who are opposed to any change".
No, I consider myself fairly openminded, and most people as well. The very fact that we're actively discussing this even after we've been through it countless times, proves that we're still open to new ideas. We just haven't found that mythical solution that would benefit all and solve the WL problem once and for all. We want to see good changes, not change for the sake of change. I do not endorse the mindset of "let's do *something*, no matter what".
And in the end, let me urge everyone to think in long term. Average NSCer has been in the game for about 90 editions. Consider if the changes you propose will make the game more fun over the course of many years and how much fun you're willing to sacrifice in order to get in 2 editions sooner.