Those are all good questions but I’m not a psychic man. How could I know what will happen in 30-50 years? I’m likely dead by then. But I’ll answer best as I can.
What dose the world look like. Not so much what would the value be but how much and how frequently is it owned and used by people ?
If governments completely bend the knee it’s much more different than if they become more adversarial to Bitcoin.
At this point I would assume any chaos with governments trying to ban it have long been done and over with so I would assume it’s used by most people, whether it be as a savings vehicle or as an underlying asset that backs whatever digital currency is the world reserve. Unfortunately it is hard to say without knowing how many different things can play out.
Volatility will go down, and already has been trending down. At that point I would assume very much not as volatile as most of it would already a have been mined.
Fees would be different depending on what you’re doing. Main chain -high fees, second or third layer fees -would be very low, close to non existent.
Custody solutions would probably likely be way more than we have today. Self custody will still make sense for some- if the government doesn’t try to stop that. But custodial solutions will still make sense to some people as well. Insurance on your Bitcoin in self custody may make self custody a lot easier, I know a start up that is working on that now, but it’s very new.
I honestly don’t jive with most people in the Bitcoin community, because many of them are just there for more fiat. They wanna be rich. I just want a solution to sound money that is self sovereign and secure from the state.
State capture is still a thing. I’m not pie in the sky delusional about it. Some think we already won because Trump won and they think a strategic Bitcoin reserve proves we are winning. That could be the case, for sure but could also be a new strategy by the state to infiltrate and maneuver plans to control it. They would be wrong to think it was that easy, but wouldn’t be the 1st time.
That would take a hard fork, and therefore I can keep running the code I want and they can give me a new coin I can either keep or sell. It still won’t be easy for them to do that but the tech is such that I can run the code I want.
Hope that’s a good enough answer for you.