McCain is a goner...bet on it. But he may drag Palin down on his way out.
And that may not be such a bad thing. While Palin brings many good qualities, I fear she has become too much of a lightning rod to be an effective president. It is hard, on one hand, to decry Obama's inexperience while promoting someone who quit before the end of their first term as governor.
While I think a Palin presidency would be great for the country, I have doubts that she could convince 50% of the public to join with her. I think she's been effectively Quayled, even by the RINOs in her own party. Better for the GOP to have a candidate the Left must take seriously.