Thanks for the detailed explanation of why you hold that view.
The other option is that Lockdown V3 works - hopefully - and therefore from around Saturday, infection rates fall off a cliff. Around 2 weeks after that we see a peak in Hospital admissions.
By my workings that gets us to...
I'm just a parent, but they should be reviewing the schools question in 4 weeks time to see which areas could reopen - a blanket "shut until half-term" is not warranted.