Multiplexes were the McDonaldsization of the movie theatre experience. Cheap, generic, repeatable, predictable. Part of me is glad they're dying, and hopes for a return of the "theatre" being put back into movie theatres, with more focus on the experience. That will come at a price though.
Obviously we need also to get past the endless copy and paste superhero movies, and start drawing back a wider audience.
I broadly agree; though, I don't think multi-screen complexes deserve the drubbing you give them here.
The Cumberland as a 4-screen arthouse worked well.
Increased number of screens actually made room for more niche product for a time; than would likely have been seen where theatres were more numerous, but generally only one screen each and therefore more reliant on proven box office draws.
The move from 3-8 screen venues to the 9-30 screen venues did represent a more marked deterioration in the movie going experience both from a venue perspective, but also cinematic diversity.
This is because this shift also really saw the introduction of multiple showtimes and screens for the same movie, at the same venue. So that a 14-screen Paramount/SB cinema instead of having 14 different movies playing, might have only 7, with the latest Fast and Furious getting 4 screens, and Barbie getting 3, and Oppenheimer on 2, before finally getting distinct movies on the rest.
It would generally be challenging to go back to the single-screen concept, as the cost of one manager on duty at every venue, plus one usher, one concession worker, and one box worker minimum sets a much higher base cost of operations.
It doesn't help matters that the business model around theatrical release films these days favours short releases, on saturated screen numbers vs a more slow burn approach.
For example, for those trying to figure out what I'm meaning, Today's model (distributors take 30-40% ticket sales, exhibitors get the rest, plus concession) tends to result in movies being in release for 4-7 weeks then gone and off to TV.
Where in a previous era, a movie would not show up on TV until at least 2 years had passed from its theatrical release date; and cinemas sometimes kept a hit movie (ie. 2001 A Space Odyssey) in release for more than a year!