Twenty years ago, you could go to the Westgate and there would 7 or 8 movies playing all along the spectrum. They and other multi-screen venues kept a couple of small rooms for well regarded movies of limited interest.
As for the Alamo note, they list movies for many different days. On any given day, I believe, the choices will not be many and all the houses are showing the same things. They do maintain spots for niche films.
The studio have just about got completely out of making movies of a smaller scale that may push the narrative envelope. They don't promote those films if they don't make them. If a studio made over a hundred million net on a movie, they might takes 10-20 of that to fund smaller productions just because they liked them. The executives were actually movie people.
I lecture. I just miss the days when I could go see four maybe five movies in a week all the way from big action to quirky. There is a huge stream of good material coming to our TVs which I love. As is common knowledge, that where quallity drama can be developed over a limited series.