So then the international borders is simply going to close until 2025? I don't think it will be realistic at all. Somehow some time the borders need to be reopened even if a Coronavirus vaccine is not available.
My opinion : borders WILL BE re-opened long before "effective, fully-tested, fully-proven" vaccine is widely available. Long before ! Whatever the pollies are saying today, can be retracted and replaced with something different tomorrow.
Right now ...
For me ..... IF I CATCH COVID (which is highly unlikely... even in NYC where 20% of pop have antibodies and so 80% do not ) ..... anyway .... IF I catch it .... I would have a 99.6% liklihood of living on , with immunity .... and only a 0.4% chance of dying. That is WITHOUT any vaccine.... I am happy with those odds.
Remember proven for other respiratory diseases... is that a bigger immune response can be more deadly than helpful... With 99.6% chances on my side, I won't be taking a vaccine.