Not really necessary, since the original mRNA vaccines prevent serious illness and death very well, against Omicron as well as every variant so far. But it would be nice to have antibodies against each variant to prevent even a new variant "cold". The problem with this idea is, when they have to go through all the trials to get it approved, another variant will pop up that isn't on the "soccer ball". More fit variants spread very quickly, so their emergence will probably always beat any new vaccine version's trials and approval.

What does work is activated T-cells, that will attack any possible variant and keep the virus numbers down until the B-cells can start cranking out variant-specific antibodies. Anybody with two vaccinations or an infection followed by a vaccination, and a competent immune system, already has that capability.

There is also some work being done to make monoclonal antibodies against invariant portions of the virus, common across all variants. If that works well, somebody will make a vaccine that invokes those antibodies. That would be a universal vaccine against every variant and all future variants. SARS1 and MERS, too.

Educating anyone benefits everyone.