In my opinion, I believe it won't. Money has and always been our medium of transacting ever since. Its value in our history is much greater than bitcoin. Personally, I don't want bitcoin to dominate the currency world. I believe the reason of bitcoins existence is to serve as another way for transacting, so people will have choices to transact. What I hope for bitcoin, is to be accepted worlwide, be part of the economic circulation and continue grow in its own kind.