Maybe they wont need to use guns in the future and will just have advanced spyware or super computers that can crack encryptions etc.
Hah. Not likely.
It probably won't ever be possible. At least not in our/your lifespan, so why should one care?
Let the people of the future decide how to proceed if it ever happens.
What's the point of encryption if it's going to be cracked in the next 5-10 years?
Bitcoin will not be replacing Fiat for another few years. Because people are ignorant and "sheep".
FTFY.