Suppose that removes all the coins and longer the official currency of the world is bitcoin. How will became the funding of public works since the State will not be able to print extra money?
a) You either steal the money otherwise, for instance take all the widows, stuff them all into an cremation oven directly after removing gold teeth and emptying their bank accounts, or
b) let those who want the money spent, pay.
I suggest b, as it sounds more peaceful, and I am a very slow person.