Just wanted to make the point that, although the vast majority of people will be fine, there are of course those who won’t.
The big issue with Covid is that it is still new. While there are some people who appear to resist it despite repeated exposure, the vast majority of the population have no resistance and are susceptible to it. And it’s the luck of the draw whether you have a mild case, a serious one, or die.
If 20% of people who catch Covid need hospital care (which is what they said in the beginning, that number may be different now that more is known), that is going to be so many people all at one time that hospitals can’t cope. That’s the danger we are trying to avert with lockdowns etc, to buy time to get the vaccine out.
Once most people have immunity via either infection or vaccination, then even if immunity does wane over time and they get it again, it won’t be everybody all at once, and the proportion who get severe illness will be much much lower. The NHS will cope with the unfortunate minority.
I heard a theory today that, in 20 years time, Covid may be much like the other coronaviruses in circulation, which cause colds. Children will get it, be mildly ill, then recover. A few years later, they may catch it again, be mildly ill, then recover. So by the time they are adults, with comorbodities, they will have had Covid multiple times in their life and their immune systems know what to do with it, so they never have anything more than mild symptoms.
Until the last time, of course. Covid will take its place alongside flu and noro virus as one of the things which are temporarily troublesome to younger people but can easily be fatal to the old and frail.