If I see Jabba's rolling fat flaps one more time, I'm gonna get mad!
Actually, we're not all done on Tatooine. We still have to see Ob1 and Luke going into hiding.
At the end of Episode III, they should have a sign like "20 years later" and then we see the deleted scene where Luke is looking at the opening space battle through electrobinoculars from ANH. That would be a great way to end the PT trilogy, connecting it with the OT trilogy.
It's not the last scene. It is ONE of the last scenes, according to GL.
Lance, in a LITERAL Sense GL can change his mind, but it is INCREDIBLY unlikely. In the interview he is doing at the time when he is talking about shooting the final scene (when he explains about how stupid it would be to move the whole crew out back to Tunisia in three years time just for one shot), the interviewer asks him
"What if you change your mind and want some more Tatooine shots?"
George answered:
"Then I don't get them."