> Does anybody think these variants will ever stop?

No but they tend to become less severe for the surviving population. Either because susceptible individuals don't make it or the immune system is learning and the virus runs out of good mutations. So far it seems that higher transmissibility was the driving factor. We still have a large percentage of the population waiting for their first infection. Next we will see more immune escape variants and then probably come the variants that diversify but they will probably run out of useful mutations and our trained immune systems are better at preventing severe infection. It could take some more years and some more severe waves (and some calm years in between) until we arrive there.

The new Joker we have are mRNA vaccines with which we might quickly sharpen our immune response before the main wave of a new variant arrives.