Probably never. It is a disease that is now established, it will diminish and assume its place in risks like 'flu., mutating all the time. - eventually controlled by a vaccine. But 'When will this crisis end?' is different.
My best guess is that children will resume full-time school in September and I really hope that something like normal life will resume by then. I hope that some sort of part-time education will emerge within the next couple of weeks (I'm an ex-teacher so this is what I home in on, OK?) -it could be done by splitting timetables so some are in Mon., Wed. a.m. and Friday - with others filling the other slots. Spacing could be observed and break and meal-times staggered.
Generally, I think it has to be sooner rather than later that these restrictions are eased. I don't expect much to be eased before mid-May - then a gradual softening. I may be wrong of course - feel free to jeer when I am proved so! :)