– “That train has left the station long time ago”
This analogy seems inappropriate; the situation is, and will continue to be ongoing. Do you think that Australia, China, New Zealand etc. will abandon their suppression policies that have so successfully protected their populations and economies, and adopt instead the majority model of unaccountable community transmission held barely in check by three month lockdowns?
Vaccines modify this situation rather than transform it. Vaccines will help countries like China and Australia achieve actual green zone status; are they likely then to open their borders to infected countries such as Plague Island UK? More likely they will open only to other green zones, and a two-tier world will develop.
The vaccines-plus-sporadic-three-month-lockdowns approach may never achieve effective suppression due to continual virus mutation. Green zone countries have the luxury of watching this from their safety, and deciding whether they wish to participate. Or not.