The problem with any fanfic stuff I've seen is it's too 'sci-fi' nerdish. Training the Jedi in the new temple and blah blah. People want the raw, galactic Empire stuff. That's why ROTS is so popular. You can relate to the people in it, as you can with the OT. The OT is just a band of friends trying to make a difference in the galaxy. When you go too far off the map, you lose casual viewers.

I say create a Prequel trilogy that involves Yoda and explains 'the prophecy', where it came from and how the Sith were almost destroyed.