IMO... I dont know how Alonso will go. He is driving a car that is very well developed and hooked up to the road. Kimi has the ability to drive thru a cars problems as shown last year, however this years Mclaren is just not powerful enough. With the new rules on engine config and aero, a poorly balanced car doesnt have the ability to be compensated for by the extra horsepower the V10 had.
Question is.. irresective of Kimi staying or going, will Alonso be able to bring an inferior car up to P1?

PS. I have been a Mclaren fan since I can remember so I'm not rubbishing a team who has achieved so much in LESS time than the supposed "best team in F1"