Pps asking about vaccine protection duration:
www.verywellhealth.com/length-of-covid-19-vaccine-immunity-5094857
Just one quick Google suggests what we all know but don't really want to know...that noone knows, because it's not been in the real world (or even a lab) for long enough for us to know.
But there's no reason to think it won't be like the flu. With the flu, we are vaccinated against the strain expected to be most of a pita the following year. I see no reason to think this will be any different, we are already seeing all the variants and some will eventually be thrown up which the current jab can't cope with.
Remember the very first people were vaccinated last December. However long the immunity lasts for, it'll be dropping off as time goes by. The nurses who vaccinated me were discussing autumn boosters - can't tell more as don't know more.
Whilst I don't for one minute think everyone will need to be jabbed again, I do think they'll want to do the vulnerable again this autumn/winter, and I can't see an efficient programme for that being set up soon - it takes time and money and logistics to create a smooth system.
So my theory of spring/summer is based on gvt being cautious in case of a surge in the vulnerable over this autumn/winter (but not going as far as lock downs, just current restrictions reinstated under some new name) but then relaxing again with having had more time to have got people re-vaccinated and with the better weather in spring/summer 2022.
These are just my thoughts. I do not pretend to be any kind of expert. I hope I'm wrong and once all restrictions are lifted that will it for good.
I just don't think we're there yet though.