IMO, governent and financial institutions wouldn't really fit into bitcoin's nature. These organizations won't just even be put in a sentence because they uphold different principles and nature in general. Bitcoin has a decentralized nature while financial institutions such as banks is the total opposite of it. Meanwhile, government is usually the one against the legality of bitcoin in their country. Hence, asking the role of bitcoin in superpower nations sounds ridiculous to me.
The government, particularly of the first-world countries wouldn't accept bitcoin open-arms like how we want to view it. Bitcoin is often scrutinized nowadays due to the various issues associated with it. That is why most countries aren't really in favor of making it legal on their place. Sure, there are several countries that decided to give it a try and make bitcoin legal, but we can't always assume it would go that way in every country. The government will not allow bitcoin to take over, most especially it has decentralized nature that they will not be able to control nor manipulate because they hate that.
Well, governments are basically accepting bitcoin with open arms in many places? I mean look at USA, they literally let it be so liberal that there is a crypto exchange in the stock market which you can buy a stock of these days, that is something seriously awesome, then there is Germany that already greenlight the whole banks and crypto collaboration thing and now there are over hundreds of billions of dollars worth of crypto moving to banks instead. Even the whole UK thing is just regulations and there will be something better.
Long story short we are talking about something that is not doing that bad and I feel like it is going to get better in the future as well, hence nations are accepting bitcoin with open arms if you ask me aside from few bad apples like china but when did china ever be nation of freedom anyway? Which is why I believe we should be feeling fine and not be worried about governments.