You kind of forgot the primaries there.
During the primaries, I'm very sure that folks like Fauxcohantas (err, Elizabeth Warren), Cuomo, and at least a few other Democrat candidates are going to want a shot at the job, and the Clintons have a *huge* amount of bones in the closet for the other Democrat candidates to drag out and show off (...and I'm talking skeletons that got shoved in there -after- Hilary's 2008 run.) Sure, the Clintons are a political powerhouse, but I suspect that the primaries are going to decimate her chances of winning; for one, she's a very polarizing figure, and two, assuming she even survives the primaries, she'll emerge from them too weakened to do much of anything.
In retrospect, the Democrats got lucky when Obama showed up, because the party's bench is pretty shallow at best, and has been for quite a few years now. In the present, looking at her GOP opposition, they're busy winnowing out the candidates *now*, a full year ahead of time (mostly due to the establishment/RINO versus Tea Party struggles), which will have the side effect of keeping the primary fighting to a minimum. Example? Well, the recent CPAC showed that the 'crowned' establishment candidate (Jeb Bush) got creamed in the straw polling, as did a lot of the retread 'perennial candidates' (e.g. Huckabee and his pals), and it showed that Christie wasn't going anywhere at all. Instead, like it or not, a handful of rather muscular candidates came out of the fray, and I suspect that the Democrats are going to need a lot more than Hillary to get anywhere. But again, their bench looks pretty shallow (if anyone on the DNC side of things know of someone who would make a better candidate that isn't as instantly polarizing, please speak up, but I have yet to see anyone...)