I understand your thoughts completly. I have also been in a dryspell, being in only 4 finals in the 20 last editions and also had a streak of 11 editions in a row without qualifying. It is rough, and it is not fun feeling that whatever you send is not worth it.
And yeah, some parts has been a bit lost of course. People that has been in the contest for a long time don't have the same time as before, with work and other things in life taking a lot of space as well. Same goes for me, who has had a lot of problems lately voting in both semis and has very little time in involving myself with the NFs. It sucks, but it is what it is.
Of course you need to really think it though and feel what feels right for you, but of course it would be really boring if you are going. But I totally understand if you will decide on leaving. But most of all, don't rush it, really think it through, maybe for several editions before making the final judgement. Maybe you feel the surge and the fun for NSC comes back again, which it always does for me after feeling down a few editions before.