People will only stop trading btc to fiat if they have to buy something exclusively with bitcoin.
Otherwise it's still more advantageous to exchange btc to fiat, as you buy anything with fiat, and with bitcoin only few goods and services.
In some countries, for instance, in Germany, Bitcoin can be used to buy things. If you are a traveler and BTC holder, it is better not to convert crypto in cash and travel with any sums on your account (in Bitcoin wallet is this case).
Travelling agencies now accept bitcoin, it is now applicable to buy air tickets, it is not gonna stable but increase the value in the world, people are using and taking advantage of bitcoin, some countries started to accept bitcoin as payment directly in their stores and people are reliably using bitcoin to buy things they needs for daily life.