This "quickest way to open" and everything surround passport of vaccine certification is pure gaslightling. It offers a small carrot with a big stick. It will not work for hospitality and they know it, so they may well withdraw that leaving other venues saddled with this nonsense.
Coercion and punishment are not sound principles in an allegedly free society.
I'm against them in all settings domestically, we won't have much say internationally, but if individual businesses wish to bring it in themselves (along with every single additional cost it entails) then I have no problem with that and the public can then make their own choice as to whether to given them their money or not.
Either the vaccine(s) are effective or they are not. The data says they are, as is take up. Everything else is political posturing, smoke and mirrors.
Sorry for the word salad.
I should also add that a judge are expedited the hearing of the hospitality industry's case for opening up along with "none essential" businesses to this coming Tuesday, during which Hancock will have to actually show the evidence they used to shut up pubs and clubs, put numerous caveats on their reopening last summer and then why they continue to remain closed.