IMHO: The unregulated mass migration that we've been seeing is absurd. Many of the people who are migrating would be of greater benefit in the communities where they were born than in their destination communities.
Economist use the term "developed world" to refer to richer nations and "emerging markets"
The economies in "the developed world" are growing at a slower rate than the emerging markets. So while there may be more money in the developed world at the moment, there is actually greater opportunity in the emerging market.
I am not opposed to migration. Migration usually has positive benefits. But the people who are migrating from the emerging markets to countries that they see as richer are not doing the world a favor. They are moving from lands with greater economic potential to places where they might become a burden on the society.
Effects on Housing
So, I live in the United States. The massive migration in the last year is straining the housing market in a few of the destination communities. The price of low income housing in the US is soaring. Poor people in the US are suffering the brunt of the strain.
The current unregulated migration is not having positive benefits of other migrations.
We never know how ypur life will be abroad. You can migrate but at the same time you have to be responsible for your acts. I was foreigner long time ago and I can say that nothing like your home.
I wanted to spend a few years working abroad to learn other cultures. I was not able to do so because the countries I wanted to visit would not give me a work permit.
It has traditionally been easier to get a work permit in the US than in other countries. I suspect that, in a few years, it will become impossible for people who are in the United States to leave the US.
There was a study done last century. The study discovered that most people (like 95%) never traveled more than twenty miles from their home in their life. Mass migration was not an integral part of human experience.
The world travels that you read about in history almost always involved state sponsorship and the people who engaged in the travel were protected by armed guards.
As for the United States. The US broke the mold of highly restrictive travel.
If we adopted the Marxian system, we would probably see a world where all boarders were closed and travel dictated by the state.
To travel is good to learn other languages and culture but to leave things behind bothering other people is not a good idea, it is better to sell them. We will have times when people won't be able to move so easily, it is better to learn to survive with what we have.