There is a high chance Covid-19 will flow the same path.
That’s not to say that a more deadly variant won’t appear it almost certainly will (or has already) but it is unlikely to become the dominant variant.
On the other hand, it seems like a kind of inverse prisoners' dilemma.
If no one vaccinates, this particular pathway for the evolution of super-viruses is closed (although others remain open). If some people vaccinate, and a super-virus evolves, they're fine and the rest are screwed, classic P.D.
But it deviates where unlike the classic P.D. where things get worse if everyone defects, once everyone vaccinates, it doesn't matter if a super-virus evolves, because everyone is protected.
So while this raises an interesting policy question on whether non-sterilizing vaccines are worth the risk, once people begin "defecting" by getting vaccinated, it seems like a bad move to risk staying unvaccinated yourself.
Transmission seem to be recuded only for 2 months after vaccination.
Unlike most viruses, COVID-19 does not have the same selective pressure to become less deadly.
This isn't guaranteed, there are plenty of viruses that are still cause severe illness despite being around for quite some time. It's entirely possible that the virus mutates to be more lethal[1], as well.
And if mortality does decrease, it could take many human lifetimes before such an equilibrium is reached. In the meantime, the virus can mutate, wreak havoc and kill a lot of people.
It's also important to point out that virus evolution depends on selection pressures, and one of the selection pressures for decreased viral lethality is a severe reduction of host organisms that the virus can replicate in. That is to say that the selection pressure that causes a virus to be less lethal can very well be the eradication of large populations of host organisms.
[1] https://www.usatoday.com/story/news/factcheck/2021/07/14/fac...