Only currency in the world. Everything from local transactions to global business everything will be based on BTC. If any country wanted to have their own currency they will base it one Bitcoin.
I think your dream cant be realized, just a dream 
If everything only based on bitcoin, then government dont have power anymore, because they cant control it. And then BTC will be under control of one global organization like UN. 
That will be the ultimate globalization.
Make an organization be able to control bitcoin can ruin bitcoin itself, which that organization can be approached by governments and take advantage with it. That will be the ultimate globalization.