There are less chances for governments to come united to make it happen as we see cold war between countries. There is a heavy competition in growing each countries wealth and they find roots to grow more. As crypto would certainly benefit the countries in their economy growth and they do realize this, there is a less chances for completely denying bitcoin. What they started doing is, as they found crypto to be strong, they themselves started creating their own crypto coins if you look at.
There may be a united nations organization but still countries are still in competition to grow their wealth and improve their countries economic condition. Some countries are already moving forward in adopting cryptocurrencies and some are still in denial because they do not want to disrupt their financial system but when the time comes when other countries are already adopting it, they would eventually adopt it too. There is a higher possibility for the countries to be united in using cryptocurrency or blockchain technology than to unite to prohibit it given that they just cannot stop it unless they turn off the internet which is not possible.