Bitcoin is a very good thing to have as an asset. Just like gold. Even better if I may say. It's secure, and unlike fiat money it actually exists and work is put into it to produce it. This makes it great to store value.
However, it cannot and will not replace current fiat money that the entire world it using. It just cannot.
Take paying a cup of coffee for example. To pay your coffee with bitcoins, one must get bitcoins first, either by mining or buying bitcoins with other kinds of money (*cough*fiat*cough). It ends up being a quite complicated process, don't you think?
Until we reach the point where paying for a cup of coffee is as easy with Bitcoin as it is with cash, we will never get mass adoption. And as far as I see it, there is no way of simplifying the acquiring of bitcoins.
For now this is the reality that we should all humbly accept that Bitcoin for now is just to be use for an investment so that we could keep a lot of papermoney. Fiat money is already tradionally use all over the world that it can be easily and very convenient to use by all people like rich, poor, and even children know how to use it. But still i believe bitcoin can replace fiat in the future if all people in the whole world will depend on computers.