The problem is
Why can't they keep the EU and make new movie at that same time? Just choose another era.
because like I said only a very small portion of the community knows about the EU. So to do a movie in another era you would get a much larger part of that fan base saying "What is this? This isn't star wars where are the characters I know? Who are these people?"
So they do Episode 7 and bring Han , Luke and Leia (obviously much older now) as something familer then they slowly bring in the new stuff. Eventually they get rid of Han Luke an Leia.