I don't have many strong opinions about what "proof of being vaccinated" should be required for (calling it a passport is dumb), but I do think "we're" still getting prematurely mad at people who won't get vaccinated when it isn't yet the case that everyone who wants to be can be. The relatively narrow window between now and then makes interim measures more trouble/controversial than they are worth. And once we get to that point, how necessary is it, really?