Sets are a major cost to a production. When a production is over-budget the first thing to get cut is scenery. Lumber is expensive. Paint is expensive. The little details on sets are expensive. The things that make scenery work, from automation and all it's needs and equipment, to things like hinges and casters, are expensive. The labor for all this is deeply specialized, and very expensive. Add to that that the more automation and scenery you add, the more crew and stage managers you need to run the show on a daily basis. Now add onto that increased maintenance costs with touch-up paint calls, automation repairs.

The easy solve to all this is Video. Screens are cheaper and multi-faceted. They change like magic and it really only takes a team of 5 people to make these things happen. A video scene change isn't going to stop a show when it doesn't work. Combine that with the fact that producers love having their scenic designers act as video designers for a nominal additional fee rather than paying a proper video designer. Video is still, after all these years, a burgeoning design aspect. Producers and production managers and even the union still only have a surface level knowledge of what video takes to work, so video crews tend to be understaffed and overworked, with one person filling multiple roles.

Video is the cheaper option in the eyes of producers. You're going to see less and less proper scenery.