If Palin wins the nomination, people will line up to be her VP, period. The irony is that you named Rubio and Ryan who each have less than half as much experience as Palin.
I am no Palin or bust person, but I am also not a Palin hater.
Palin is the likely nominee, provided she runs. Most famous, most popular. She should look around for a conservative who does well with Independents and Democrats, because the media hits have left her with pretty high negatives with Ds and Is.