I do think there's a very high chance we could see Universal Monsters as a future expansion to USH, but I don't think it would be a copy of Dark Universe as it exists at Epic Universe.
While different in a lot of ways, I feel like there is too much thematic overlap between Hogsmeade and Darkmoor with their aesthetic, both taking place in the streets of an old, small village. They both also have their rides take place inside a castle, and utilize the same ride system.
I think they'd have to take a different approach if they ever bring the IP here.