Smart contracts aren't something that can kick the governments out, nor can hold something so important and set it into stone. It takes a lot more than that in order to replace the government and have the people believe in what you are saying. While it's true that a lot of people are already fed up with the governments' control and lack of actual welfare to their citizens, but is our current society ready to make the leap away from what's already in place for a few millennia now?

Crypto can be, at most, a way to work around unjust restrictions imposed by the governments, but definitely not something that will overthrow or replace it.