So, this is interesting. If Monstropolis is both the coaster and a show (plus a playground?), I like the plans for it a heck of a lot more. Interesting that I suppose if that is the plan then either replacing MupperVision or replacing Disney Jr could be the location for a show. Of course, Disney Jr isn't a proper theater and would need a lot more work to make it viable.
And on that note, if they were adding the door coaster but otherwise keeping the MuppetVision building that would they'd have to be putting the coaster at least partially on what is currently backstage (I'd guess they would remove Mama Melrose and use the footprint plus space behind it)
I... don't hate it. I think AC is better as there is less of value there, but I'm not so wedded to MuppetVision that I feel like it can never disappear, especially if the Muppets get some other attraction (or it gets put somewhere else).
A big reason I like AC better is that thee is potentially a lot more room and they can build more with the land. Monstropolis would definitely need more than just the door coaster in terms of attractions. My biggest issue with losing MuppertVision would be that the park needs that capacity especially as an all ages continuously running show. It wouldn't be ideal to lose that during construction, but it wouldn't be as terrible as losing MV and only getting the door coaster