Well, Alonso, Webber, Vettel and Hamilton are the obvious candidates. I will be very very surprised if someone else than one of these four wins the title.
Alonso and Vettel seem to be very sure of themselves. Alonso is leading the championship despite having had quite a noncompetitive car for most races this year. Now Ferrari are ahead or at least thereabouts in terms of pace, too. So it’s hard to imagine Alonso dropping out of the title contention. The combination between Vettel and Red Bull speaks for itself. Webber is obviously much stronger than he was last year but I think he needs to have those really strong, Silverstone-like weekends more often to make me believe that he is finally capable of beating Vettel over a season.
Hamilton is probably a bit underrated at the moment. He has lost many points because of somebody else’s fault but the streak of bad luck should come to an end at some point. The team is sure that there is nothing fundamentally wrong with the car so, even if Webber falls behind, I don’t think we will see a ‘classic’ two-way fight for the championship between Vettel and Alonso.
Somehow this year reminds me of 2005 when Alonso won the title with consistency even though the competitors had quicker cars. I’ve got a feeling that Fernando simply won’t let the DWC slip from his hands this year.