I am certainly all for a Potter extension as long as it stays in cannon with what is already in place. Sorry, but as a Potter fan, the last thing I want is a bunch of Harry Potter attractions that are just thrown into the available space without thought as to how it actually fits the already established theme. You just cant have Diagon Alley mixed into Hogsmeade, it's just weird and very wrong(and I'm pretty positive JKR will have my back on this

). But there is still a lot they can do to keep it all in cannon, such as the Shrieking Shack, the Forbidden Forrest, a quidditch attraction ect.
However, if the do use the LC space, the main thing I ask for is some sort of entrance buffer area between Potter and Suess Landing. Just can't see how you can walk from one, directly into the other without laughing hysterically and how jarring that contrast would be.
As for warm butterbeer, yeah, I don't know about that, but I'd be all for the
warm pumpkin juice. I hated it cold but thought, it would be awesome
warmed up on a chilled day.