Based on some data it appears most of us already "have it"I think it ends in a surprising way. We "all" get it. Most of us (vaccinated) don't go to the doctor. Then one day we wake up and the hospital numbers are way down. That might not happen for a year or two, but my unscientific gut feel suggests that's how it will peter out.
Examples:
https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/COVID-19/Sero-prevalence-COVID-19-Data.aspx
https://jamanetwork.com/journals/jama/fullarticle/2784013