I am new here so please don't flame me.
![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif)
I personally don't think it could replace the fiat system but it could complement it. Currently in my opinion BTC is a store of value; though it was supposed to be an peer to peer electronic payment system. I ain't complaining but you know..
But I am happy my value in BTC appreciates over the years though.
![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif)