Royal Rother I think that is exactly it, yes.
Allow 3-4 months of a flattened peak for the younger elements of the population then release the oldies and have a new peak. If it all comes at once it would be completely unmanageable.
I'm thinking more in terms of the psychology
Imagine you are 75 and you have been "locked up" for 4 months
(think of fitness, vitamin D issues, psychoses as well)
Now, you've been reading, watching TV and you say that "outside"
is 57 Million people with 60-100% of them tolerant to the Coronavirus
and maybe carrying it (not clear if they would be, but I presume so)
You would be stepping into a minefield. It would be like taking
a holiday in an African village stricken with Ebola.
I think a huge number would be too scared to leave the house EVER
It's Ghettoisation, an infringement of civil liberties. Selective house-arrest.