I think it's a good move. Lucas might be the mastermind behind Star Wars, but he is not the greatest director of the world. Many people could do a job as good as him - or better. Episode I and II were not as amazing as they should have been. And what's the alternative? A new trilogy would have come anyway and I prefer a clean cut instead of an old man ruining it because he did not retire in time.
So I am curious to see what Disney will do with this big universe. Let's just hope they will do no reboot... I'd prefer a prequel or sequel.
Imagine a Christopher Nolan Star Wars trilogy!
(I know it will not happen)