Bill, like many CS people, doesn't understand biology well enough to couch his statements. We could do what he said, and not have that outcome. In particular, I really doubt that some sort of magical herd immunity shows up when; that's been a wild guess of some scientists for a while, but it's not really a firm prediction.

BTW, with some of the newly designed vaccines, if the virus mutates, the vaccine can be rapidly changed to respond to that (because it's sequence based). That changes things a lot.