Looks useless to me; dropping R to below (but not much below l) 1 means a super-slow decline; you might need years with such a regime to eliminate the virus. An

Looks useless to me; dropping R to below (but not much below l) 1 means a super-slow decline; you might need years with such a regime to eliminate the virus. And it doesn’t actually provide herd immunity, just a slow die-off. Which leaves most of the population vulnerable, and re-introduction a possibility. You have to get R significantly below 1 and the whole ecosystem (for the US: the whole world) to do it. Or, you need herd immunity compatible with the R that you can maintain indefinitely - which la likely >2 so immunity needs to be >60%. Any other way leaves you with the possibility of reintroduction as far as I understand.