I don't see anyway possible that they remove The Muppets, HISTK, Pizza Planet, Mama Melrose's, etc. for SW land. That would also mean the removal of Streets Of America, and there's just no way. I think the author may be smoking some silly stuff.
While the author may not see the value in them, HISTK could easily be re-themed to Bug's Life and the Muppets are seeing their biggest resurgence in popularity in 30 years. It'd be insane to remove it now. The restaurants in that area are also entirely too lucrative to be going anywhere.
If SW gets the land it so desperately deserves, it'll go out into the parking lot.
The only other area I'd think it may expand would be around Echo Lake - taking over American Idol, Sounds Dangerous and Indy (although IMO, Indy needs to stay or be replaced by an Indy ride) but this would be more likely to be in addition to the expansion to the parking lot.