Victor Davis Hanson thinks she needs a little more wilderness time:

No Way 2012 — Maybe 2016, 2020?
But if, a big if, she decides to become a national political figure, Palin should use these next few years (in addition to making some money to support her family) to travel and read widely in the manner that a Reagan did in his wilderness period. She has natural intelligence and is curious. I think most would like to see her do another Couric interview five years from now after she had time to size up DC insiders, meet more politicians, lecture in front of hostile audiences — and just read and reflect. At fifty-five she could become a formidable candidate, given her natural charisma and authentic middle-class persona.
victorhanson.com