"They could theoretically seize control of everything anyway, so we should just let them seize control of everything now without a fight" doesn't seem like a great argument to me.

Things like the constitution, separation of powers, checks and balances, and decentralized control of communication and commerce serve as bulwarks against tyranny. That they all could be dismantled in the future is not an argument against doing our best to preserve them now. Tyranny is not a binary state, it's a gradient with many steps along the path thereto.

(Also, "taking money out of the system" is not optional; payment systems cost money to maintain whether it's done by a private entity or by government.)