If people start using crytpocurrencies in their every day transactions, peer-to-peer (keep it out of the exchanges) more and more, the fiat monies controlled by the bankers will get used less and less.

• Start offering to pay your friends and family back in cryptocurrencies.
• Chipping in for something? Offer to do it with cryptocurrencies.
• Accepting a private ride share? Offer to pay them for gas with cryptocurrencies.
• Paying the babysitter, landscaper, housecleaner, etc...? You guess it... see if they will take part of it in cryptocurrency.
• Bartering? Same thing.
• Yard sale? Make it easy for the people buying to pay with crytpocurrency.