Definitely. Fiat currency is still alive. The earnings we have through bitcoin trading and investing is based on fiat value. And I am sure that you exhanged your bitcoin for fiat currency to buy things you needed. Computers, electricity, internet service, and gadgets that you use to earn bitcoin can be paid still by fiat currency.
yes that is a fact that most of the people are converting their bitcoins in to fiat for buying or doing shopping, actually the main reason behind this is that in most of the area there are no facilities of using bitcoin directly in local shops, but still there are too many opportunities of using bitcoin for online shopping.