The virus will mutate freely as soon as it spreads widely. There was never any chance of completely halting that. So vaccines are a response to otherwise unmitigated contagion at some later point in time. Also, the problem of "leaky" vaccines are of course not completely unadressed:

https://sciencebasedmedicine.org/countering-geert-vanden-bos...

https://www.deplatformdisease.com/blog/addressing-geert-vand...

https://healthfeedback.org/claimreview/covid-19-vaccines-don...

Most probably current vaccines will have to be updated, but evidence do not yet point towards this being a bigger problem.