> Classes are only a fraction of the in-person university experience in the USA today.

I guess it really depends on the type of student. If I were a college student now, classes alone indeed are a fraction of the in-person university experience. Besides classes, I'd also need:

  - Challenging homework and rigorous scoring and feedback -- this would be critical to my future success. Standard tests won't cut it as I need my professors and tutors give me feedbacks on my proofs, my homework, my assignments, and detailed and usually lengthy and overly verbose reports. 
  - Opportunities to work on a research project with my professors and senior students. 
  - Office hour with professors. 
  - Seminar-like classes that students and professors dive deep together on a subject. 

Luckily, remote learning can enable all such requirements. The only inconvenience I can think of is that it will be hard to work on a math-intensive problem on a whiteboard, but even that is solvable with something like an iPad and a stylus.

Things I'll miss: libraries. I used to check out 10 to 20 books a time, and spend hours and hours in my college libraries reading them and doing assignments. Classmates turn to friends. There's so much fond memories of hanging out with friends I made in college. We can probably make it up by hanging out online, but the experience will be different from face-to-face interactions.

What I don't need and will be glad to see them gone: all kinds of crazy sports programs. Yeah, football or basketball or whatever. They're nice, but I'm not sure if they are multi-million-dollar nice, at least not to me. I don't give a rat's butt if Caltech didn't win collegiate basketball for 37 years. So what? For all I know, Caltech will be the best college as long it provides the best STEM courses and produces the best research results in the world.