Yay I love it when teachers and schools are all thrown into the same pile 
Sorry but not all teachers (by a long stretch) used the school closure as a long holiday.
The teachers in my (primary) school provided a full curriculum. 4 or 5 pre recorded lessons a day. We didn’t do live due to some child protection issues that prevented some classes from being allowed to go live - so each day the teachers recorded their lessons from home - two or three videos for maths and literacy to allow for differentiations, plus the rest. All work that got sent back in was marked and feedback and targets were set. We sent online reading books and children were asked to film the reading once a week so that parents could get detailed feedback on what to work on. This continued for children who’s parents had decided they weren’t returning in the summer on top of the normal day. Plus this term, for anyone who has had to isolate.
I’m fully aware that not all schools did this but why do teachers and schools always have to be painted with the same brush?
I could paint all parents in the same light based on who actually did work with their child. From keeping track of work coming back, about 50% of my class did the majority of tasks.
From the other 50% about half of them only did the maths and literacy and were essentially “hot housed” in the traditional subjects. Another chunk did the reverse and only did the more fun projects, such as the craft and the exploring tasks. And then another group did absolutely nothing and parents said as such.
And funnily enough, all the children who did absolutely none of the work in my class had stay at home mums or both parents furloughed. 
So if I’m going to act like some posters on here (not everyone by any stretch) I could lump all furloughed parents and stay at home parents together and say I hope you enjoyed your nice long time off doing sweet bugger all! What exactly were you doing? Laziness. Except of course I’m not going to do that, because I don’t believe that at all and I know it’s not true and everyone has their own separate circumstances.
Stop putting everyone together. Some schools didn’t do the online learning well at all and should be held accountable but for crying out loud, making all teachers redundant? How is that going to help? And what jobs in the shattered job market exactly are we going to do instead? Don’t think universal credit will go down well with people either.
I have very mixed views on the schools closing again, largely because I just don’t know what is best for the situation we are in.
All schools and teachers are perfectly capable of doing an online curriculum, and I support parents in demanding it. My school did, I know plenty of other schools that did, there’s no reason why not. Of course online is not as good or as motivating as being physically present in the classroom and having the teacher right there to help or steer in a different direction.
The problem is more at home. Some families have one computer screen between them and more than one child and more than one parent. Some have no screen or internet or printer and no money for simple resources like their own pens and paper or a calculator etc. Younger children will need support and supervision which is damn hard if parents are working. Some children just won’t connect school and home. Some parents can’t be bothered. Some parents just don’t know how to help them themselves. Some homes don’t have adequate space to do work.
The problems with online learning are different from home to home, child to child, school to school. I don’t think anyone truly wants the schools to shut but OP your solution is very extreme. If we do what you say, trust me they won’t be open again!