"actually stop this pandemic"
I think that's wishful thinking. This will be globally endemic just as the flu is. It will continue mutating in the unvaccinated population as well as the non-human carriers (like pets). Sure, if a lot of people are vaccinated, then it might slow the timeline down for when that mutation will emerge.
"There’s nothing stopping a mutation from really killing 50-75% or more of people. It’s a war of virus vs humanity."
A neverending war, as it always has been. I think the 50-75% casualty numbers are highly unlikely.
