Just like many times in history as technology advances, such as how we couldn't stop mice/rats from spreading into other countries with ships - well before the crossing of the Atlantic/Pacific oceans reconnecting the Americas to the rest of the world.

Now there could be some small population in bats in a rural area in Asia which had some virus with a random mutation and it will no longer be isolated to those areas.

We've ultimately benefited greatly from breaking down these transportation and economic barriers and there's no going back without a serious regression in a ton of other areas (unless you want to live in a 'hermit' kingdom like NK). So it's a new reality we have to learn to adapt too.