I agree with you. It's true China has been growing consistently but America's history has pulled a lot of partners that keeps them steady with their dominance in the market and economy.
As for Bitcoin leading the world, it seems unlikely as many countries will surely not accept it, at least their government.
I just wished African government would just embarrassed Bitcoin and make it as a legal means of trade but the question is what will now happen to our local currency?
LOL.. embraced, not embarrassed. Big difference.

So far CAR (Central African Republic) is the only African country that has given any sort of recognition to Bitcoin. Now coming to the national currencies, out of the 50+ African nations, which one is having a strong national currency? Most of the countries are suffering from inflation and their national currencies are very weak. BTW, what is the point in having so many different currencies across the continent? Why can't Africa have a single currency? But that would mean all the 55 member nations of the African Union entering into an agreement on this topic, which will be very difficult to obtain.