I think that cryptocurrency can be safely seen in execution immediately after it is legalized. Because a lot of things depend on it.
Cryptocurrency is almost used by people all around European countries and in the US and Canada. Bitcoin has been in wide use in the said countries and even in the countries where it is not legalized. Though illegal, it is still used to speculate for gains. Microsoft is willing and has actually announced officially that they accept Bitcoin. You could pay for a suit in a local shopping mall in the New York or Vancouver.