Yeah the Bud Westmore building is not going anywhere. It’s too centrally located on the lot to be feasibly moved elsewhere. Expanding the park in that direction would essentially overhaul the entire studio, we’re talking billions of dollars for that.
The four stages, numbers keep changing so I can’t remember what they are now, that are behind the mummy, adjacent to Transformers, are earmarked for theme park expansion. I don’t have any real inside info, but the show I was on earlier this year used one of the stages for our swing sets, and we were talking to production about the possibility those stages wouldn’t be around if we got picked up for another season.
(Side note too: those 4 stages suck. Poorly designed, not very sound proof, and some things aren’t up to code but have been grandfathered in. I’d be happy to never work in those stages again lol)