I think it is fair to say that most well-to-do people would not uproot generational homelands and livelihood to take a chance being an unknown in a foreign landscape, even if one has connections there, and yet, this current migration dwarfs the post-WWII flux. Sure, maybe I myself set out on the horizon in search of (mild) adventure, but I find it hard to believe 4% of humanity are crazy like me.
That alone speaks volumes at how successful we are at governing the planet, assuming, of course, that data matters in the least, which, presently, it does not.
Migration and Human Mobility: Key Figures
https://www.migrationdataportal.org/key-figures