WRT: Muppets and Star Tours, our insiders have said that (at the moment)...
- Star Tours is destined to be reskinned (if not totally removed). It won't be Star Tours anymore, nor would WDW want a Star Wars simulator to stick around when SWL will feature a much better one. So, merging Star Tours with Star Wars, which was once on the table and now definitely off the table, isn't happening. So, there's no need to Star Wars to go through Muppets.
- Grand Ave is sticking around, and SWL will expand in other directions.
Now, that doesn't mean that Muppets won't be overtaken by some other IP in the future, but given the current indecisiveness of what else to do at DHS, it looks like Muppets is safe. It will certainly be a big people eater in the Fall when the park is overbrimming with guests.