As far as Episodes 1 - 3 goes, they are just proof that Lucas did not have a story, if at anything, he had a very , very basic outline.
With episodes 7-9, there are a lot of stories that they could cull from. The new Jedi order, just being one of the many.
Do I think it\'ll happen? Of course. Remember that Lucas said there would never be 1-3, after Jedi, but after time passed, he decided it was time for the prequels. I believe the same will happen with 7-9, though I do not look for Lucas to direct them and maybe not even write them.