Bitcoin will still rely heavily on fiat money, but bitcoin will be an option for payment using fiat money, if we want to make payments in practical situations, we will use bitcoin, if the situation is normal then we will still use fiat money.
What about using bitcoin as payment for goods and services? Do you think that will ever happen? Instead of paying with fiat money, it will be bitcoin instead? Do you think its possible?
People can choose to use bitcoin as a payment method to buy in future but as of now most of the people either using it as an investment or using it for gambling. In my country, I can't buy anything with bitcoin directly as of now so I'm investing only for the future profit. I buy things with fiat because they give security to buy online with unknown people but if we use bitcoin then need to pay an additional fee for the escrow and it may take even longer to deliver goods.