Concerning the ending of ROTJ, I kind of like the new music. Yub Nub is one of the low points of the OT. However, any respect George gains for replacing Yub Nub is immediatly canceled out by replacing Lapti Nek with jedi Rocks.
Adywan has been great at giving us a little something old and a little something new. I hope he can find a way to work a small section of Yub Nub into the new celebration music. If he can pull that off, it will be the middle ground that everyone can be happy with.
As far as seeing other planets, I think Coruscant is the only planet we need to see. The others don't matter to the story. (Wow, the people of Bespin are free. Now I can sleep at night!)