Idk, there’s a point of view over this that seams very reasonable, and it’s being proven (imho).

People who emigrate tend to be the “best”, aka: the educate youth, the working class, people running from other people causing trouble. This means that the country of origin gets a way harder time developing, sometimes even become worse the most people go away.

I think there’s an example of this on a great part of Latin America. 10 years ago it used to be a better place to be. But as more and more people run away from those troubles to USA and Spain the people causing troubles are the ones left back there. And in most Latin American countries it can be said that the developing process has not only halted, but in some places have even start regressing.

I’m a little pessimistic on this regard. I don’t believe that the whole world will develop on this country. Quite the contrary, I think we’ll began seeing more and more countries becoming worse over time. Other instance of this is the Arab World, many countries that started developing on the last century have fallen nowadays in islamic fundamentalism and basically a middle ages revival.

You concatenate this issues with climate change and I think humanity are in for a very bad time over the next centuries.