There are many topics on this subject already.
Please, see that there are several countries without any kind of income tax already, just as there are countries without their own currency. Never underestimate the nation-state, it's a super smart and fast evolving beast.
I agree that the nation state (and the people behind it) are super smart. But a fast-evolving beast?
Bitcoin's pace of evolution makes the nation state look like a horse-drawn carriage to Henry Ford's Model T.