Well, facts that are present right now tells us this: Roger will still be present for a couple of years, and he will not easily give up on #1, Rafa is still very young, and we are all aware that there are not many players who can beat him on clay. Novak is a rising star, he shows some dominance on hard courts, just have won his first grand slam, and he can beat any of these two... Both Rafa and Novak will be chasing #1, and no one is safe on any position any more... So I think, that the next few years are going to be a tough few years for all of them... Finally, we have three almost equal players fighting for ATP #1 position... It's going to be very interesting...