Everything is spreading. We're a large interconnected world, and we'll inherit everyone's problems eventually. There are better alternatives, but it's not something people will seriously consider.
Do you live in the American continent? Look at the skin tone of most people you find in the streets. Go to a library and try to find out what was the average skin tone in your region 600 years ago. Compare both. Thinks have been spreading for quite a while. Migratory species are older than ourselves. Jet stream can carry spores over oceans. World commerce is older than you think. Wars and migratory movements has alwa…
I'm aware that trade networks long precede recorded history, and potentially precede fully-modern humans. The fact that you can have homsapien admixture (eg: homo sapiens + denisovans) far, far outside of Africa is proof enough for that.
The time scales did use to be different, and speeding things up as much as possible does not seem to be a good thing.