If hospitals get overwhelmed regardless because too many people won’t get vaccinated then I can see the case for it - obviously wouldn’t be happy about it.
The problem is we're starting from a point where the NHS was already underfunded and having a crisis every winter. When was there last a winter without reports of hospitals turning patients away because they were full and ambulances queuing outside A&E? That gives you very little room to work with. A slight uptick in covid hospitalisations could create a major issue.
That's before you even consider the backlog. I finally had tests last week that have been postponed multiple times in the last 18 months. Next week, fingers crossed, I get to see the consultant and hopefully find out what treatment I need. Last thing I need now is to find out what I need and then the NHS be overwhelmed and not be able to access the required services.
Is there an element here of you can't have it all ways? People don't want to wear masks, they don't want social distancing, they don't want access to hospitality & events restricted, they don't want lockdowns. You can't just standby and watch as the NHS gets overwhelmed.
In any case assume this is all precautionary and hopefully won't be needed. Better to have a plan in place then wait until we're at crisis point and start discussing what to do.