So long as the vaccine appears to be safe and effective, I'm game.
It may not be "mandatory" by law, but... without your "vaccination card" one may be barred from some things. Public schools, certainly. Probably most private schools as well.
I can see access denied to public buildings without "the card" as well -- local, county, state, federal.
Want to vote? You may need your card (and we ain't talkin' about ID).
Private businesses?
"No shirt, no shoes, no vaccination... no service..."