Well my partner will be in trouble if it is not. He has 3 full Quebec caravans and 3 Enlgish ones plus 2 airstream ones with canadians in them. 2 lost seasons could finish him. I suspect by late summer most Americnas and Canadians are vaccinated, this should die down to an acceptabel level, but you neve rknow. The next 2 months will tell. The big unknown is mutations. For me it's a hobby, for him it's his income.
I want to drive down in October, but flying may be the only option. I can absolutely see proof of vaccination being required to cross the US/Canada border once it re-opens for awhile at least.