Whilst I am not an epidemiologist, I talk to a lot of people in clinical trials every day (you know what I do). Right at the start of the Pandemic I was told that the most likely outcome from all this was that the virus would mutate and get weaker over time, with us all eventually being infected and re-infected numerous times over the course of our lifetimes. The challenge was seeing out the period of time that it took for this to happen. We've all had the Spanish flu apparently- it now gives you the sniffles instead of killing you.
Sure - that theory has been widely discussed and I’ve heard/read it many times.
It’s not linear though, which was the question asked by [MENTION=236]Papa Lazarou[/MENTION]. Without going away to check it feels like Alpha caused more bad outcomes than the vanilla Wuhan variant and then, in turn, Delta was another step in the wrong direction. If that was the case, we've already witnessed that it's not a general trickling down of severity from variant to variant.
Ultimately a virus variant “wins” over other variants by being more transmissible and out-competing them, so it feels like (to this layman, anyway) the ideal scenario is to have a highly transmissible variant that causes almost no illness at all. This seems to be, broadly, what we're hoping for with Omicron, but I'm not sure there's any biological guarantee that another variant won't come along that is both more transmissible AND causes more severe illness.