what planet are you on? there have already been multiple studies that show the efficiacy of existing vaccines are not as effective against some of the variants. don't doubt that there will be bootsters for this
And we’ll probably have more mutants appear. We’re hitting all time records in new infections. The more infections, the more copies, the more risk of an imperfect replication (mutant) that’s worse.
I’m happy that pigs and birds don’t seem to get COVID-19 (and hoping that’s not a mutation away).
No variant has been shown to evade the leading vaccines to the point that they are not effective, and there has is no established timetable for when immunity form vaccines fades.