Experts estimate around a year before the current Covid-19 vaccines become obsolete due to new variants that are different enough to infect people who are vaccinated.

The conclusion is clear: we must vaccinate everyone and soon, to cut off the evolution of the virus.

Who gets the limited current supplies of the vaccine is a side issue. We can't avoid the development of mutant strains by vaccinating A instead of B. We have to vaccinate them both.