I'm of two minds when it comes to the prequels. There is my idealistic side, which imagines something entirely different for the prequels. It would be more adult and serious.

But then there is my realistic side, which realizes that even the OOT had some lighter moments to make the serious stuff work.It's also a matter of what can be done. Realistically, yes we could replace Jar jar with 3PO, but could it be done effectively enough to make it better?

Would toning down some of Jar Jars more absurd antics and parhaps giving him a more meaningful backstory and character arc in TPM be more gratifying as a whole than a shoehorned 3PO?

One of the problems I have with the prequels is how small it made the galaxy seem. 3PO made by Anakin, R2 owned by the queen, yada, yada, yada.

Hey, you know what? What if 3PO gets his covers lost in the beginning of the film and then he's all wires and stuff to match the existing footage of him in TPM? Maybe Anakin wants to help him out and somehow(through fan edit magic!) he gets new coverings?

Hmmm...to quote Indy in Last Crusade: "I don't know I'm making it up as I go." :P