It only takes one person or gathering to start another outbreak and start raising the infection rate once again.
I think you misunderstood
I was just giving a hypothetical example of how it likely won’t just go away with social distancing.
As long as social distancing keeps the rate below 1 it will automatically go away as each new generation is smaller than the one before. There will be outliers who infect more but they will keep shrinking until they disappear
People here were saying no herd immunity so I was playing along.
I agree there is no guarantee of herd immunity here. I’m explaining that the concept of herd immunity works the same way. I’m not writing out the whole thing now but here is a link you can read
https://en.wikipedia.org/wiki/Herd_immunity?wprov=sfti1Basically, the percentage who are immunized works to lower the R0 to less than 1, which causes the disease to eventually die out. Social distancing the R0 to less than 1 would have the same effect.