I don't think that's how vaccines generally work. The virus won't actually disappear, it'll continue to be spread among the unvaccinated, and eventually people

I don't think that's how vaccines generally work. The virus won't actually disappear, it'll continue to be spread among the unvaccinated, and eventually people not at risk become at risk due to changes in life circumstances. I'm also not sure there's quite the bright line you seem to be suggesting between "at risk" and "not at risk." Young health people still die of COVID-19, just not at as high a rate as already-unhealthy or older people.