> (One thing I am ignoring is the real difficulties and cost from professors to teach large remote classes in an actually effective way. I'm sure administrators will ignore it too.)

One of my colleagues teaches intro physics to 1000+ students remotely. It seems to work quite well actually. His TAs screens the questions students have -- it's not like there are 1000 different ones, many a similar/same. He says the large audience is actually an advantage: If he explains something bad/wrong, at least some of them will pick up on it and ask.