Yes of course migration has been going on for millennia, but it is much easier for some people now when you can move large amounts of capital at a drop of a button (no currency restrictions), purchase a house/rental in advance etc etc, do job applications and even interviews online. You can organise a whole life remotely now.
@DuncinToffee - yes, for those with just 1 passport. We live in London, most people I know have at least 2, some have more, up to 4 in some cases. So their mobility is not restricted. Maybe that is the biggest privilege now, freedom to move freely and have a choice on where to live.
Interestingly, places like Sweden and Switzerland are changing very rapidly now with migration. At a really fast rate. It will be interesting to see if they retain their social democratic value systems or succumb to the Brexit/Reform nonsense we got here.