My big question is, will they make Episodes X, XI, and XII? I am going to guess that Episode VIII and IX won't beat TFA at the box office if they follow the pattern of the past two trilogies. With a December release, it may be different.
After Episode IX, we are supposed to get another anthology movie, that has yet to been announced. Ewan McGregor has said he wants to play Obi-Wan again. There have been rumors of an Obi-Wan trilogy, but I wonder how they would make that happen with Obi-Wan supposed to be living on Tatooine.
Back in the Lucas days, which he claims he never said, there was talk of both nine and twelve episodes. I believe the twelve episode plan involved two trilogies based around Luke, Leia, and Han with the Emperor showing up in the second of those trilogies. At this point, I would think another trilogy would focus around Rey rebuilding the Jedi ten or so years down the road from the current trilogy.