What's ironic is that Republicans are always labeled as just a bunch of old white men, and yet the only candidates getting any attention -- Warren, Biden, Webb, and Clinton -- are all over 65, and they're all white...
I'd say there's probably a 35% chance she implodes before the primaries. It appears the long knives are out. The whole email thing was leaked by someone within the DNC, and she's done a lousy job of damage control because she and her handlers incorrectly assumed that the media would provide cover for her.
Instead, you have CNN, Fox, WaPo and the NYT all asking the same questions and questioning the legality of the whole thing. This might turn out to be just too damaging to recover from.