That's pretty naive way of looking at things. It's not fiat monetary system that is a problem, but government.
But, you can't deny that the government must be involved. The system requires a central point of failure to work. It's designed to be corrupted at some point in the future. You're the one who sounds naive; if it's a theory that doesn't work in practice, it's a wrong theory.
But, you cannot solve this problem with monopoly money like bitcoin.
Read what you're typing. Bitcoin, monopoly money? Then what's fiat that is exclusively possessed by the central banks? Also, you pretty much can. Bitcoin discriminates money and state. It promotes free trade and censorship-resistance.
That's a pretty big IF.
Indeed. Bitcoin can't disappear currently, it's a science fiction scenario.
Anything that you set up can be shut down.
You don't understand how things work. Become disciplined and learn.