@Todfod Button has a ‘long-term’ contract and I don’t see them ditching Perez after one year either.
Ferrari should get rid of Massa, Red Bull is losing Webber, Lotus has no drivers signed yet and the rest of the field isn’t an option for Raikkonen, I think.
To be honest, while Kimi might be one to not talk about it, Robertson usually has been very straightforward about his negotiations with teams, like McLaren for 2010 not working out. Sure, Red Bull can send him one final offer, but Robertson never said never, just that the previous negotiations have ended. Basically, the rest is all deducted by F1 sites, fans alike.