The WotW set should never be removed, its one of the best things about the tour IMO
As impressive as it still can be, particularly for people who've never seen it before, its time feels like it'll come sooner than later, especially now with Whoville being razed a stone's throw away. Compared to things like the
Jaws encounter or the
Psycho house, which both celebrate indisputably iconic Universal properties,
Worlds isn't a film that's necessarily a crown jewel in the studio's history.
If Universal was willing to get rid of parts many of us considered some of the "best things" growing up that gave the Studio Tour character, whether it's the lagoon's parting of the Red Sea, the cheesiness of the Avalanche/Mummy tunnel, or even the disuse of the collapsing bridge, then I personally feel like they'd have no problem pulling the trigger on the
Worlds set if/when the time comes. Honestly, I'd be okay with losing it if it meant something new went up in its place, either as part of a future park expansion (like Alexander mentioned) or as something new for the Studio Tour, and would only be bummed at its loss if they simply did nothing at all with it afterwards (again, looking at you, dancing cars location).