What will happen with Blockchain technology in the next 50 years?
Probably to recesses of government control that you would not wish upon anyone.
Wholly-digital economies are the worst possible for thing for average citizens and dissidents in the modern society, and it will only get worse as you see governments seeking to control their populations with what amounts to an invisible iron fist. You can see it happening now in the UK, US, Canada, Australia, Germany, etc.
Blockchain technology is great when kept out of government control. The bad news is that they will find a way to exploit it and force you into it, whether or not you want to. Better make sure you want to be an even less-valued cog in an even more uncaring machine.