I hope that happens, it would be nice to see bitcoin as a global currency. It would be easier to use in buying something and im sure that it will get bitcoin's price to rise dramatically. I would love to see that happen.
I really think you could wait way beyond 2018 to see bitcoin becoming a global currency in the sense they really want.
But, I can tell you man, that our bitcoin is right now a global currency. I used it from New York to London, from Amsterdam to Paris.
The global currency I fear is the one issued centrally by the FED, the ECB etc.
So that's not bitcoin case.