Molson Hart

We'll eradicate all the circulating common cold viruses before SARS2 using the lockdown right? I guess there are places not locked down which will serve as a reservoir but it is funny to think that in a month there may not be any common cold virus left in places under lockdown.

R0 is dynamic. It's not determined just by environment (density and humidity etc) and the nature of the virus - it's also determined by herd immunity. So, even if flu X or cold Y is a more infectious virus, it may go down easier because it faces greater herd immunity.

The short incubation and infection cycle associated with the common cold dooms it where lockdowns are observed strictly.

All colds or just the common ones?

I don't know the full set offhand but all the common ones should be able to be burned out in a 1-2 month lockdown.