Harry Potter is what happened there. Hogsmeade is probably the biggest blow to Disney's theme park dominance. It's why Disney has gone so hard with franchises everywhere. It's disappointing they went this route (somewhat, I think Pandora/Radiator/GE are great additions to those parks) but it makes sense from a soulless money making perspective.
If Hogsmeade never opened or if it sucked, I think we would've kept getting original rides.
I wonder if it's possible for Disney to buy back individual characters. Black Panther has almost no presence in IOA, it wouldn't cost Universal anything to give him up.