Covid will be gone in the US by the time this rolls out. Current US coverage is @13% already, and increasing by .3- .5% daily. And thats going to those who are vulnerable, mainly.
And that is besides the evident herd immunity that is kicking in. Which already has made Covid disappear from NYC and other areas hard hit last March-April.
It may still be useful abroad, if there is a cost advantage overall.
Agreed