If I'm not mistaken, Hülkenberg got an SMS saying he wouldn't get the Ferrari seat for 2014 because of a certain Kimi Räikkönen. About Räikkönen's performance this year - let's just say the gap between him and Alonso isn't 1.5 seconds per lap in normal conditions. The car simply doesn't work for Räikkönen's style, Vettel has very similar problems. Ferrari have the additional problem of being badly managed, so I don't think Räikkönen's season will get any better. Hopefully the car will be better for 2015 - he does, after all, have a contract, and Ferrari have two top drivers in the team and will want to make the best of it. They're in a mess right now, as not even Alonso is happy, and he is far more comfortable with the car (though he has a history of adapting rather well whereas Räikkönen is comparable to greased lightning in a car that suits him but won't drive a tractor).
There does seem to be a problem with being Ferrari's "second driver", though (Alonso and Räikkönen are technically equal, but currently, it's not really possible). When Massa went to Williams, his driving instantly improved. When Räikkönen went to Ferrari, he now has to battle the car rather than just driving it. Hopefully James Allison's input on the 2015 car will help Räikkönen, the two have successfully worked together in the past at Lotus.
As for Bottas, he still doesn't get the same amount of press as Räikkönen, but then again, the latter has been the shining star of Finnish F1 since 2001. Bottas is rated highly by many, though. He seems to be underrated internationally, though, which I find puzzling. Especially the amount of Massa hype is odd, because Bottas has been better overall this year.
Button has lost his edge, but is still a very good driver. Magnussen's speed shows his potential more than Button's decline. He still has to weed out his mistakes, though - he's made contact only with Räikkönen twice!