I would like to think that Bottas will be in F1 in 2013, at the earliest. I think that Bottas will be either in a Hispania (as part of a free Williams transmission deal) or at Williams in 2013 (replacing Maldanado). But it is all dependant of what he can do if he gets a seat in GP2 next year.
However i belive there are drivers in GP2 that are every bit as good as him, also FR3.5 has drivers every bit as good as well with Vergne and Wickens.