I have thought semi-deeply about teaching online. I do believe it can be done well, but only with a lot of effort, and (at least in my department) I don't think it would save the university money, if done well.
Personally, I'm not terribly eager to invest this effort. I've had a poor experience with our university's training, and also I just like interacting with people in person better. Maybe I'm just being selfish, but there are a lot of other things I can do to benefit my university and my students, which I'd enjoy more, and I'd rather invest my efforts there.
That said, I do think that universities who are willing to hire faculty for remote work could develop fantastic online programs. There are tons of dual-career academic couples that don't get jobs in the same city, and try and make some crazy commuter marriage work. Hire them.