From a story perspective, though, I'd argue Jar Jar was originally intended for greatness. He plays too big a role in TPM to just fade out the way he does. Logically, he should've gone back to Otoh Gunga, but his winding up in the Senate but just playing the dupe once shows he was supposed to stick around, probably to mature and wind up a less loathsome hero or martyr.

I really think, though he'd deny it to his dying day, George caved in to fanboy griping and cut Jar Jar back significantly.