But the concept of is still viable. You just have to formulate it to work with bitcoin.
Such as using btc coins to transmit your purchases and transactions for instance.
What do you mean by dead way? For me fiat is the most popular way of using to purchase everything we need because bitcoin is not yet worldwide accepted.
But if bitcoin will be accepted by almost all people in the world for sure no one will ever believed fiat and we will all shift into bitcoins or crypto currency.
And for the meanwhile let's just keep on supporting bitcoins and as well as fiat because we still need it.