One thing which government-issued fiat currencies have going for them which cryptographically secured fiat currencies do not is taxes. Someone who lives in Wind

One thing which government-issued fiat currencies have going for them which cryptographically secured fiat currencies do not is taxes. Someone who lives in Windsor and commutes to Detroit every day will have to pay taxes in US dollars for the work performed in the US and then pay taxes in Canadian dollars because that person lives in Canada. They need to have some amount of US dollars and some amount of Canadian dollars even if they can do all of their shopping, rent, utility bills, etc. in Bitcoin. Since taxes are done in the local government-issued fiat currency, local businesses need to hold some amount of that currency anyways. It is simpler and cheaper for local businesses to do all of their business in that currency not to mention it sidesteps the issue of dealing with currency risk.