You mean that chicken thing? Total different. But it could have happened. Sars-cov died off because it was too deadly and not enough infectious. Imaging there was a vaccine against Sars-cov to make it less deadly. Perhaps we could have kept it in circulation and natural selection would have eliminated all the anti-vaxxers...

But Sars-cov-2 is different. It is without doubt in circulation and mutating. Less it mutates, less new versions it can make. Because COVID-19 vaccines limit replication and transmission, they also limit new variant emergence. Had this person that gave omicron to the world been vaccinated, omicron would have lost its change.

Now about omicron infecting more people who have gotten booster is completely wrong. Totally. It is just your anti-vaxxer mind messing with you. This is the way your dark mind functions - making things up.