From the G7 agenda reporting: “ Last Friday morning, during an interview on Good Morning America, U.S. Homeland Security Secretary Alejandro Mayorkas said the Biden administration was taking “a very close look” at the possibility of vaccine passports for travel into and out of the United States. However by Friday afternoon the Department of Homeland Security was clarifying Mayorkas’ statement. The DHS says there won’…
That's certainly a possibility if safety really is a concern. But I'd wager that the average American anti Covid fanatic (the sort: Masks are fascism! It's like what the nazis did with the jews!) is not really the kind of person travelling the world.
I don't think that others, who want to travel the world really mind getting the necessary documentation.
The whole principle that you need to prove vaccination to be let into a country is not really new. And there's the yellow vaccine passport issued by the WHO, which exists for decades.
I needed to show proof for a yellow fever vaccination when travelling to Venezuela. And that was in 1989.