I'm a lecturer.
This won't happen. Students have often finished teaching by early Dec, they will move then, not wait til Christmas proper.
Having said that, I did a tutor session yesterday and the number one thing they were looking forward to this year was being more independent and having a purpose. Sitting at home with parents online doesn't facilitate that. So, many young people are enjoying being away from home quite a lot (which their parents may not truly appreciate, with all of this talk of bringing them home if they only have limited contact time).
I'm not sure what the population want us to do. If we go full campus, rates will rise. Local people don't like that. If we limit numbers on campus, by doing things like cutting face to face contact in half, parents complain they 'only' have four hours or whatever (when actually four hours of seminars is fine for a humanities subject in corona times, not for science, self-study is the order of the day at uni, they aren't at school!) If we go completely online everyone is indignant there is no face to face teaching and worried about mental health.
It IS wrong that universities should be prioritizing their bottom line by opening halls if teaching is online, however, that's on the government and those who voted for the government. If we don't have students paying to be here, and paying to be in halls, our business will simply collapse, and we are NOT eligible for a bail-out, this has been refused outright by government so it's try to generate income or mass redundancies and some unis going under. That won't enhance the teaching experience of next year's cohort either.
I have been quite inspired by some of the lovely students I've met who seem to be making the best of a bad job. I hope we are doing enough to reach out to the ones who might not be coping so well or are feeling isolated- but if you look on MN, half the population feels depressed and isolated. For many young people, being away from home, having a bit of independence, meeting a few nice people (not 100's) and going onto campus two days a week for a couple of classes is infinitely preferable to sitting at home without the possibility of work or travel and feeling like they have no purpose.