It's certainly a surefire cash cow, but I'm a bit unclear on how it's going to work. Are two movies going to be ancillary character developments and the third movie of the year an "Episode VII"?
Who knows. But they can do what they want.
Ep 7 could be an into to a whole host of spawn of Luke and Leia/Han, or a complete tangent, with others being brought in later.
The point being that the Marvel plan was simply to establish the characters in their current guise, then tease about a collaboration, and then do the collaboration (in the case of The Avengers, to very entertaining effect).
All of this is made easier by not calling Episode VII "Episode VII".