They have the sets and gargoyle costumes to do a hunchback house If universal wanted to. ( Not sure how hunchback fits with the monsters) but universal technically could do a cathedral house and borrow existing sets or props or gargoyles from older houses.
What if they paired hunchback with phantom of the opera, ( I don't know if their timelines align)
Hunchback and phantom aren't as famous or big as dracula, but it would be a really cool looking house
Add invisible man to the house and you could do something unique.
I don't know, I'm just thinking of the characters that are left to use, and the sets that they can do, and phantom of the opera could be Fighting invisible man. ( Both humans) evenly matched
(I don't know who they could pair the creature of black lagoon with)
But people have complained so much about the lack of Dracula this year, there are SO many complaints, that I can see universal doing a full Dracula house,
I think that universal could do a Dracula- only house and everyone will be very happy. No more monsters besides dracula. No crossover
They already had a Dracula house in 2009 and it was really scary. It was really dark and gory.