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VFX has gotten to the point where they aren't going to need many physical sound stages anymore. We have a lot of insane developments in realtime CG happening fast.
We are prob going to see almost all of universal Hollywood transferred to park space eventually over the physical sets.
I wouldn't jump to conclusions so fast. Backlot sets may be falling out of favor when shooting on location (or with CGI) is more popular, but the lots won't be wiped out entirely. Television is the main source of production, these days, and they require ample sets & soundstage space.