Originally Posted by Chase Windu
I've known Alec Guiness didn't really care for Star Wars that much for a long time. Though I think it's more that he didn't want to be remembered for just Star Wars since he's done so many other great works and he didn't really want it narrowed to one character in a couple of movies.
That was my imrpession as well. IIRC on the OT DVDs Lucas mentions that it was in fact his idea to "write Kenobi out of the film" because there was really nothing left for the character to do. So who knows...