Nope, I certainly think not. Because people who don't use bitcoin doesn't need bitcoins at all because they don't know about it or don't give a bull's crap about it. But we, who use bitcoins a lot certainly need those paper currencies. And won't survive without them for now because not a lot of stores accept bitcoins. And it certainly wouldn't be healthy buying cheap things with bitcoins. Imagine how much transaction fees would cost and how long till every confirmation. That alone should be enough reason why bitcoIn won't be kicking any fiat ass any time soon.