both JPM and Kimi have their contracts up for renewal next year. If either of them is serious about winning a world championship, money will not be the deciding factor. McLaren has everything going for them, new sponsors and a great team of people around. Newey leaving will be something but they will get someone to replace him. If Kimi goes to Ferrari, he will have huge expectations and a new environment. kimi is not the most personable person and at Ferrari they are expected to be likeable to the media, whilst at Mclaren they are more clean cut and tell the media only the barest minimum. Mclaren is a better fit for Kimi, he has been groomed there and is Ron's golden boy. JPM on the other hand is a bit more brash and personable, he's got a hard edge to him like schumi and will be a better fit for Ferrari. Couple of years ago, he was thier first choice. Don't be surprised if he does go.
Whatever happens, whether JPM or Kimi goes. it'll be one of them unless somehting major happens, McLaren will have the strongest driver line-up since senna and Prost. Now thats worth paying the admission price to see that. Same equipment and strategy, just find out who is the better driver.