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It was a good selling point, only now it seems that vaccinations don’t prevent the spread as much as previously thought, especially the variants such as Delta variant. So it seem there won’t be any herd immunity anytime soon.

https://www.telegraph.co.uk/global-health/science-and-diseas...

Unfortunately the Delta variant is sufficiently contagious that there will be no significant herd immunity effect to protect the unvaccinated. I encourage everyone to get vaccinated if they can, but vaccinated people can still spread the virus. Eventually almost everyone will be exposed.

https://www.businessinsider.com/delta-variant-made-herd-immu...

When (or if) herd immunity is reached (measured by rate of community spread), they can drop the need for vaccine passports. The passports are just there in the meantime while infection rates are high.