We all know that Bitcoin is one of the best ways to invest your money. However, we know that Satoshi wanted to change money as we know it rather than new investment model.
How do you think, will we be using bitcoin as payment system? Or it will stay as it is and this bubble blow up one day?

And how do you see it's future?
Bitcoin is blowing up now. The price before has increased dramatically. In terms of payment system, I think bitcoin can't be a mode of payment in online shopping or in any other form. The problem in Bitcoin is the volatility in which the price changes from time to time. Companies would be taking risks because the items has stable price while bitcoin is not. Also, transaction fee is slower and higher in Bitcoin.
Because Bitcoin did not use as a primary payment method. It is simply just an optional for payment on some countries accepted Bitcoin like Japan, Korea, etc. and its market does not limit at some countries, its value depends on all users on worldwide and not easy to keep its value while many people want to earn profit through its volatility.