George Lucas sold LucasFilm to Disney to Protect It
Ottway Ducard stashed this in Movies
If he doesn't get James Bond, I see this as an interesting possibility.
Maybe 25-30% odds right now; Inception and TDKR show that he can properly write and direct a massively marketed and budgeted original film and series-based film.
Doesn't Nolan prefer his themes dark?
The Star Wars franchise -- like Marvel and Pixar -- is about hope and the triumph of good.
Inception and Dark Knight are much more morally ambiguous.
I think a Dark Episodes I-III is exactly what people wanted.
Now that you mention it, that's probably why we were so disappointed.