I've been active online lately since I needed a FB account for work, so I have a mini-crusade against local anti-vaxxers, and that includes a lot of fact checking and learning just to tell people they are wrong. (I'm even getting threats, which I take as a compliment for doing a good job,)
One of the possible fallacies I encountered from "hesitant" people is about the viruses evolving to be less deadly, so as not to kill their food and transport (us). If you look at the relatively long incubation period and the average time to kill at 14 days, I don't think there are any evolutionary pressures for the Covid virus to be less deadly, there's plenty of time for the host to infect others before dying.
You could expect such pressures being applied on Ebola as it's too deadly too quick to be good at spreading, but it needs a big reservoir to produce mutations faster (which it doesn't have afaik).
Well, at least that's how I understand virus evolution at the moment. The conclusion is that only transmissibility matters, the next mutation can be more or less deadly, and it wouldn't make a difference.
The other issue here is that two vaccine doses are fine - for several months, but the drop off in antibodies is significant, so you get less protection. If you want maximum safety you really need booster shots every 6 months (which may even need to be tailored to currently dominant mutations).
Hopefully we'll get longer lasting vaccines.
We are up for an omicron wave right now, and the bad thing about it is that even Covid survivors who are supposed to have high protection get re-infected and I suspect people who took their last vaccine months ago are at risk as well, not just the unvaccinated masses. So be careful out there folks, we are in for a ride.