I think the most likely is Rosberg. It could even be this year, if Mercedes stay strong, and the form of the rest of the field remains as varied as it has been.
Webber has a chance, but as mentioned above, it’s difficult to see him beating Vettel for a whole season, so if a Red Bull is going to win more championships you could say its likely to be Vettel.
Similarly, Grosjean looks promising, but he would have to consistently beat Raikkonnen if Lotus were to become a WDC team, then I think it would be with Kimi, rather than Romain.
And on that theme, Massa has lost it, but if he regained it, he’d still have to beat the best driver on the grid to get himself a Championship.
In terms of drivers that are potentially good enough, but not yet in the right team, then I think Perez is the one to look out for.
Di Resta and Hulkenburg are also both strong.
None of those three are going to be the next new one though because I don’t think they’ll get a top 4 team drive before around 2014/15…
In reality though, with the strength and depth of champions on the current grid, I could see us easily not getting a new champion until 2016 or 17.
Vettel, Hamilton, Alonso, Button and Kimi all could potentially continue for a further 4 or 5 seasons – Vettel and Hamilton considerably longer than that.
And whilst those 5 are in the sport, and in the top 3/4 teams, its hard to see anyone else winning a title…
(apart from Rosberg! :-) )