because you cant do nothing with bitcoin that you cant already do with fiat currency. this is the real and hard true.
You can make a phone call by going to a website and paying in bitcoins without signing up.
You can send money worldwide for less than pennies.
You can use your cell phone to pay for things instead of carrying around a phone AND a wallet.
You don't have to worry about identity theft with your cards.
You can vote anonymously and securely.