The world needs to do that, section by section.. let everyone decide when is best for them, but everyone needs to do it. It will only return to areas that allow movement without quarantine.. don't allow movement without quarantine, and risk is severely diminished.

Some may be predisposed to dying of Covid, as it currently exists, just through genetic lottery. Allowing it to become stronger just expands that pool.

Antibodies have a limited shelf life. There's a reason the delta32 mutation exists with the prevalence it does, and it might be that those humans had to have that to survive, previously. So "centuries" is entirely possible.

The virus is controlled by preventing it from reaching new hosts.