Unfortunately, this isn't how it works for most people right now. I doubt there are even 100 people on the planet who can truly live without any exposure to fiat currency. Even for those fully committed to a Bitcoin standard, fiat still dominates as the unit of account. For example, if you need to fix your roof—even if the roofer accepts BTC—they'll likely still quote the price based on the BTC-to-fiat exchange rate. So if Bitcoin happens to be down at that moment, it could significantly impact your savings