Why do you think Palin would lose the primary or refuse to participate in it? That’s a straw man.
A few previous successful GOP names come to mind....Bush, Dole, Bush, McCain, Voinovich, Collins, Snowe, Specter, Dewine, Graham, Schwarzenegger, Steele, etc...
How about because she is currently polling in 3rd place?
There are many more reasons to believe she will not get the nomination than to believe she will.
One can hope that something happens and one can find ways that it is possible that something will happen. That is different than objectively looking at a situation and figuring out what will probably happen.
A RINO dressed in hopeychangey clothes will probably be the GOP nominee. There is a chance that Palin will make a 3rd party run when that happens. The question is....What will you do??????