A few thoughts on “mild illness.”
Early on, the medics were using “mild” to mean “does not require hospital treatment.” So yes, there were some people with mild illness who were what the lay person would consider very ill, as in persistent high fever, severe aches, unable to get out of bed etc. In some cases for weeks.
There were many more like myself - irritating cough and very tired for a couple of weeks, but still showered and dressed every day - just not a lot of energy. But fully recovered.
And there are many, many more who had a day or two of a sore throat or felt a bit off, and then bounced back.
So, it’s on a spectrum, with a large majority being towards the milder end. However, it is impossible to predict with certainty who will be mild and who severe. We can identify the risk factors, and we know that the severe cases are more likely to be older, obese and have other conditions. BUT there are some people like that who sail through with barely a sniffle, and other fit young people who end up in ITU. And there are some people whose symptoms persist for months, and some who have permanent organ damage.
So, unless we manage to eradicate it altogether, there are always going to be some cases, and a tiny proportion will be severe or result in long term debility. But at the population level - not enough to cripple society.
The main new ongoing impact will be the requirement to self-isolate for 10 days if you test positive. However, thanks to the vaccines and the resulting herd immunity, that is unlikely to be large swathes of the workforce at any one time.
We still have to work out how to support the hundreds of thousands with long Covid, and pay for the cost of testing, vaccinations, furlough, support to businesses etc. That will be with us for decades in the form of higher taxes. Got to be.