I think they want to do that...however it doesn't fit because of the placement in the park.
Here's my gripe:
1. They went cheap and never redid space mountain so they could overlay it
2. I was at
Disneyland during the stupid Halloween overlay and didn't get to see the Star Wars
Star Wars needs a roller coaster...it always did and always will. Not simulators and dark ride spinners.
I hope one day in an add on we get one. Imagineering will never beat gravity and velocity...so instead of trying to defeat it - ally with it.