It's pretty obvious what's going to happen unless we do something very drastic.
The world population will continue to grow, esp in poorer countries. Only China has made any attempt to halt unsustainable pop growth.
The global flow of more and more people to all regions of the world will put more pressure on resources, and will mean everybody in the G8 countries gets poorer.
Eventually, due to the massive burden that will exist on state welfare programmes, there just won't be enough money left for anything else.
Society will collapse eventually. We'll end up in a post-apoc world with no electricity, no fuel, etc.
Then massive population die off will occur.
Ultimately, whatever happens, I believe a massive die off will occur at some point in the /near/ future. It is the only rational conclusion based on our growth and diminishing resources.
And the fact that as we get poorer there will be less funding for scientific advancement, as the coffers will all be drained to provide wellfare for an unemployed population.
So you have two likely outcomes:
1- civilisation eventually crashes and we have massive die back
2- the western nations decide to intentionally let people die to save themselves.
What happens today is just another step along the road to eventual collapse. Our technology cannot save us from ruin if we continue allowing ****hole countries to exist, and people keep breeding regardless of their environment's ability to sustain them.
I guess that sounds harsh, but a lot of people just want to believe the world is rosy and we'll always advance and solve all our problems. It isn't so.