I personally still need FIAT money to exchange Bitcoin currency into FIAT, because in my country the government still has not legalized Cryptocurrency. So if I go to the market to buy food, I still use paper money.
Me too but that's okay for me because at least our government still able us to use crypto compare to others who impose a total ban on it. But you know what? I'm very proud to say that our usage of crypto transactions are quite growing now. I say so because the mobile wallet I used, which is the biggest here in our country, offers several means of bill payments such us for electric, water and internet consumption. We can also buy prepaid load through this. Anyway, I admit that we're still far from the mass adoption but having those improvements are not bat at all, right?Nonetheless, there's a possibility that Banks will adapt to Blockchain technology someday making paper money extremely outdated. Just my thoughts 
It is not a possibility any longer, it's now a reality 
. One of the most popular banks here in our country already starting to adopt blockchain technology. For more info, check this out.