Realistically, there's basically no chance of vaccinating enough people fast enough on a global scale to stop the virus mutating further and reducing the vaccin

Realistically, there's basically no chance of vaccinating enough people fast enough on a global scale to stop the virus mutating further and reducing the vaccine efficacy, probably not even of reducing the odds of it that much, and it's not even clear that the countries with the best vaccine rollouts will manage to stop it spreading at this point. And that's despite vaccination on an unprecedented speed and scale for a disease this new, using technology that didn't even exist a few years ago.