The current world power will not allow bitcoin to become something more than it is now. But it would be interesting to see what happened then.
Anything can happen in the next 10-20 years, who knows about bitcoin at that time, as Satoshi said about bitcoin;
in 20 years there will either be very large transaction volume or no volume., we will find out in 2030.
Not all the government are agreed on ban bitcoin or legalize bitcoin, like in Japan.
If what he meant was bitcoin as the currency that will dominate the world upon traditional fiat currency, it depends on people's choice.
Even if the government ban bitcoin, we can still use it by using a VPN to access overseas exchanges, yet bitcoin still can't accommodate a global scale at one time.