that would never happen. If they did ever decide to make a POST ROTJ story they would never follow the books. We know Lucas doesn't follow the EU when creating new stuff.
Lucas does follow it a bit, allot of EU made it into Episodes 1-3 and allot references in the tv series.
(name of planets, characters, star ships, and back story dating back to the old republic, there's more but im not naming it all) Who do you think it was that named the planet Coruscant? It was given its name from a POST ROTJ book. (Timothy Zahn i believe)
Second Lucas will never make another star wars movie again at least thats what he is saying right now.
Eventually someone else will have the rights and they could make a EU movie
Also one more Edit Lucas authorized quite a few things in the NJO series including chewies death