I think a more difficult question is what happens if there's no herd immunity AND no vaccine. Will we be able to live like this forever? I suspect not, so how

I think a more difficult question is what happens if there's no herd immunity AND no vaccine. Will we be able to live like this forever? I suspect not, so how long will we try? A year? Three years? These are rhetorical questions, I hope we don't have to find out.