I don't think that governments and banks are supporting cryptocurrencies but they are willing to adopt a blockchain technology to optimise their process. However, the core concept of blockchain is all about decentralization and when it comes to the government's projects, I don't think that government will anytime share the control with anyone else including the users so it doesn't make any sense to me in that way. It is true that we don't have the mass maturity yet and hence any news from the government might affect the price in the domestic territory.
At this age of cryptocurrency development, there are still a lot of undiscovered territories in between the banks and the governments and crypto. For example, we talk of Bitcoin possibly becoming the main currency of the world. We shall ask, will the governments accept that? Will they ever accept a decentralized financial system? And even if they do, will the rich bankers, that actually dictate the decisions of the government leaders around the world, allow such a thing to happen?
There are so many other uncharted territories in between. It is exciting to see how things eventually unfold.