I think Webber could win with one of Newey’s Red Bulls, if he didn’t have to beat Vettel to do it. I don’t see that happening and he’ll probably retire before Vettel leaves. Massa probably won’t come as close as he did again, Sutil, Maldonado, and the Toro Rosso boys will probably never be picked up by a fast enough team, I’m not sure di Resta is fast enough or Grosjean clean enough to win consistently, Hulkenberg is solid but only occasionally brilliant, and given the funding constraints winnowing out lower-level drivers, I doubt the next generation will be as good as the one we’ve got.
Rosberg could do it if a good enough car came to him: he might not be the fastest, but he’s consistant, he won’t throw away points. As long as he keeps up with Hamilton this year it’s a possiblity, so he’s on my list. Perez is already in a front-running team, so he’s in contention a few years down the road, (if he doesn’t screw up too badly this year), he’s still a little flukey but he’s not bad. For my third, Kubica. He’s apparently been wicked fast in every car he’s tested this winter, he’s had no shortage of offers in other series, and he still wants to do F1. I bet in a year or two, someone will build him a car he can drive (one-handed if necessary) and he’ll be back.