My wife may not be a fan of that idea  

I see Bitcoin as a very good way to spend my funds, it sure gives me a ton of entertainment and a chance to actually have something with a bit of value in the future.

Now you asked:
 how would the use of decentralized currencies be preferable to the current system of banking?
 This would cut out Central bank which makes all the policies such as bailing out Big Banks, inflation rate and unlimited printable debt but most importantly keeps the corruption policies at bay.
How would it's mass use make my life better than it is now? You would have cheaper products without the fee's (such as up to $.10 a purchase) and the ability to send money to anyone anywhere without the need of an expensive third party. All the money is 100% proven to be where it is due to the blockchain.
Why should we as a people throw our support behind this cause? Because it stops corruption, kills the unlimited printed money, saves on fees and lets you have control of your money. There is no chance of counterfeit currency which is actually a big problem and everything is accounted for.

Banks currently tell you how and what you can do with your money, such as you can't withdrawal certain amounts without their approval (OF YOUR MONEY) you can't take certain amount of money on a plane, you can't take so much across certain nations.

Crypto is a revolution and one that needs to happen.