I think schools will return eventually (I've no idea myself about any statistics on teacher resignations/turnover), but I do think that universities may change for good - at least the arts-based degrees - and possibly also 6th form colleges
Tuition fees are massive now and are often justified by all of the infrastructure/libraries/central facilities available, but we now have at least one year of students, many of whom will be running up huge debts for distance learning modules (and some also stuck paying for accommodation that they cannot use). All of the library resources can be digitised and put online - in fact, all students could be able to access all universities' resources, nationally and worldwide.
The enormous costs of accommodation would be gone for those able to stay living with their parents for a few years longer. Actually, if studying is mainly online and on-demand, they could have part-time (or even full-time) jobs and be earning money towards their own housing, whilst doing their studies in the evenings/weekends/days off, instead of going backwards in the housing stakes for three or more years before they can hope to start gaining a foothold.
For science/practical students who do need access to labs, sports/field facilities, specialist equipment etc., I can imagine this still being the case, but it becoming the norm to register with your most local uni and travelling in from home on a day-visit basis.
I think this would be very sad, as university is about so very much more than just studying, but it's the way I can see things going.