Same thing happening all around the world, even poor countries threatened by population collapse.

Even if you can convince educated, relatively younger population of poorer countries to come and work for you, integration is a real issue. As an expat who lives in a rich country, I can say that; it's not easy. But if most of the native population turn into seniors, especially if they start to feel like a minority(age/ethnicity/cultural gap), I think that would be very annoying for them.