This is basically how I see things going also. In the Bitcoin as a Kardashev Hinge analysis, Bitcoin becomes the authority to print money, based on the total amount of solar energy coming in from the sun.
So we won’t be spending Bitcoin as an everyday currency, but distributing it to grant authority to print money from proof of work tokens, at a rate of about 1MW per Bitcoin.
All money, including all fiat currencies, will be proof of work tokens though, freely issued with one condition, the rate of issue of all has to be less than the intrinsic value of the energy rate (Power capacity) defined by the amount of Bitcoin held.

In theory, an individual only needs a very small amount of Bitcoin as authority to print their own currency…