That's just silly. Majority of the world still operates in terms of fiat. Until the day where you can pay nearly everything (rent, food, bills, and other misc cost) with btc, the world will still be pegged to fiat until there is a global monetary collapse.

If you bought your car for 100 btc, then price btc price crashes to $7/btc, but you get an offer for that car for 105btc, are you going to take the offer and consider it as profit?