We can't stay locked up for 18 months.
Its not feasible. I think pretty much everyone is agreed on that.
So what do we do? September is no different than June.
I don't known why many are so fixated on June.
So we start opening things up and schools go back in June.
There will most likely be an increase in infections. Whilst We don't really know how much children spread the virus, there are many adults working in schools.
Hopefully those most at risk will be protected.
So we have 7 weeks or so of some growth and then the schools shut for the summer holidays.
Do normal illnesses spread as much during school holidays?
So the situation starts getting a bit better again.
Schools go back in September but its getting to close to winter with more bugs about and more risk.
But more kids / teachers have antibodies because they have already had the virus. So its not as bad in September as it would have been if we had kept the schools shut.
I know neither option is good I wish we could all keep ourselves virus free and we would all be happy and financially comfortable doing so (and after too) but its not the case.
I would expect there to be proper testing and contact tracing available before any school goes back.