I don't care about that, I truly don't. What for? Traditions worth their salt survive and thrive to these days and will continue to do so. The rest can disappear, just like endless stream of such disappeared over millennia. Its not that I want to push for this ASAP, but its eventually inevitable with the way we live our lives and move around.

Life for me is about more important matters - family, friends, my own happiness going back to everything. And yes eventually world will over-mingle, the only way this won't happen is some proper catastrophe that will return whole humanity, or tiny remainder of it back to caves.

You want benefits of travel trivially globally but forbid people falling in love elsewhere and making kids, moving for better life or simply location/climate/culture they feel is much better for them?

In 1000 years most if not all countries we know now will not exist, maybe even memories and records of it will be vague and incorrect. Thats the lens I use to judge what is worthy of an effort and what is not.