Just so silly. More theater. We're already seeing millions of new cases per week including the strains with mutations to the target spike proteins - what problem does this solve?
International travel is an orderly place to apply a filter, just as hospitals test all admits (even those without symptoms).
Blocking all visitors from specific places – even places with lower rates of prevalence than here! – was silly theater. This is actually well-targeted to reducing the interactions of the likely-infected with the uninfected.
(If a city or state/province even wanted to set up internal borders, & require on-the-spot quick antigen tests to enter regions of actual or attempted-infection control, perhaps even anonymously, that'd also be a well-targeted intervention far better than the other theater we've been fed so far.)
Some may, but that's a county/state decision.
Adding this rule but allowing people to run maskless because "muh rights" is not going to accomplish anything.
The US is performing badly when it comes to controlling the virus, but it could still get significantly worse.