Fifty years ago, not many people would have cared if travel was cut off. The world is a different place now and countries (continents?) are not as isolated as

Fifty years ago, not many people would have cared if travel was cut off. The world is a different place now and countries (continents?) are not as isolated as they are now. You can't get away with blank travel bans any more because it would cause a huge disruption for a lot of people.