I think one reply to your concern about the importance of businesses who accept the currency is this. Businesses will basically want to trade their goods for an

I think one reply to your concern about the importance of businesses who accept the currency is this. Businesses will basically want to trade their goods for any sufficiently liquid asset; government currency has no special status except that it is what they need to pay taxes. All US businesses might move over to bitcoin for some reason, but they’ll need USD for all their taxes, so government currency retains its value as compared to other conceivable private means of exchange. The theory is about sovereign money in particular, and the only essential reason businesses are interested in the national sovereign currency (when they could transact in any medium of exchange and store value in any valuable asset class) is taxes.