Another myth to bust: Wuhan stopped short of 20% of the population being infected -- how can you say it will be 20-60% who will get it? FACT: yes Wuhan is short of that. The epidemic is not over. China is restricting travel from outside (irony!) but COVID certainly still there...
and if not, will be reintroduced. China's crackdown remarkably effective but people are still susceptible. Viral spread resumes when social contact does. Virus doesn't remember the social distancing of the past. 1918 showed this and so does basic logic.
So the number infected in Wuhan to date (more than confirmed, but still small relative to size of the city) is nowhere near the ultimate number that must be infected to achieve herd immunity so that infection can't transmit readily even with normal social interaction
