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.
And then BTC will be under control of one global organization like UN.

That will be the ultimate globalization.
Yeah that is the great vision and my dream is that even a small grocery shop guy should accept payment in bitcoins then only the purpose would be served and wherever we go or whatever we purchase there should be a notice that "Payment is accepted only in bitcoins"