The GOP hasn't won POTUS without a Nixon or Bush on the ticket since Herbert Hoover. As much as voters don't like political dynasties, they apparently do in the case of the Bushes and the presidency.
As cardboard and RINO as Jeb is, he is IMO, less worse than Milt, Santorum and Paul are. Again, I like Newt (although I don't think he can win in the general election in November), and have posted scores of times I'd like to see Paul Ryan or Mike Pence “drafted”.
Can another Bush win? It's too bad we have such crappy choices to choose from.
While technically close, it's difficult to understand what Nixon and dynasty have in common.
No, America, with the Adams, Bushes and Roosevelts (are their others?) as examples, is not dynastic. That was the old days mostly.
Now days it's all about cultural infusion and outlets.