I don't see anything wrong with serialized media, the problem is people are not also taking chances on more novel stuff. Even when it gets made. "Moon" came out fifteen years ago and I thought it was really good but damn near every time I bring it up I'm the only one who even heard about it. "Knives Out" was great, "Glass Onion" was alright, we get weird stuff like "Pig" and "The Menu" and that's all stuff with big names and decent budgets. There's tons of smaller stuff coming out too but if you don't pay attention or seek out film festivals, or know someone who does, it might as well not exist.
Are theaters just too expensive for casual audiences? Is the opportunity cost too high? Or is it just a marketing failure?