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Who knows. Assuming we can get some sort of vaccine equivalency rules in place, maybe not until the pandemic is "over" for the most part (which probably means enough vaccines and boosters and people willing to take them to make covid like the flu). In total honesty, if people choose not to be vaccinated and that means they can't travel for leisure/work (or go to the pub) then that's a consequence of their choice.
I’ve got friends here who’ve had exceptions granted for family care (UK and US resident parents visiting). The process works pretty well all things considered. In honesty I’d prefer that than just saying “fuck it, who cares” and opening the borders like there’s no pandemic; we saw how well that worked last year.