Yeah, I boutique hotel themed to Potter is too far fetched and cheesy in my opinion. I can see them make a family hotel with themed suites or towers, like have a Minion Tower, Potter Tower, etc, but not a full Potter hotel. If there was a place where they could've done that, it would've been super expensive and exclusive suites as a part of The Leaky Cauldron for Diagon Alley.
To get back a bit on topic:
I hope that eventually Universal adds another attraction devoted to Universal Monsters.