The rub is that there are a lot of people on Earth. And, early evidence _might_ suggest that the vaccines that are available lose effectiveness sooner than originally thought. For example, [1] shows evidence of diminished effectiveness after 146 days.

Back to "Our data show that anti-disease vaccines that do not prevent transmission can create conditions that promote the emergence of pathogen strains that cause more severe disease in unvaccinated hosts." and whether that implies that "for anyone who did not get the vaccine to get it." This sounds like a strategy that hinges on everyone on Earth getting vaccines and frequent-enough booster shots. What if that's unachievable though? The logistics for that would be unprecedented. What are the consequences of trying but failing to do it?

[1] https://www.medrxiv.org/content/10.1101/2021.08.03.21261496v...