The spin-offs could be awesome though:
It's got to be these.
Pre-TPM might not be as popular.
There remains the possibility that spin-off movies will be inspired by sequel trilogy characters:
Jaina and Jacen Solo
new charaters dealing with the Yuuzhan Vong invasion
Grand Admiral Thrawn
Gavin Darklighter (if they don't choose Wedge and Tycho during or after OT)