No one has ever been conferred immunity from the common cold or influenza. Everyone has been infected repeatedly, some even lost loved ones due to the cold and flu, but not a soul in the world has become immune to the cold and flu.
The idea that people will become immune to the Wuhan Flu after infection is to assume right from the start that this strain of flu is totally different from other strains, and that it is more resembling of chicken pox, or measles. There is no evidence to suggest that.
That is why we LOCKDOWN!