Who could tell bitcoin can be worth $ 450? If you go back five years, this was just a dream.
What will happen for another five years is highly speculative and fun predicting.
Bitcoin is created to be used as money, if becomes super popular probably will be regulated and used as alternative currency this is best he can, i think. Calm down, collect as more as you can, and enjoy.

Yeah the ultimate goal is that bitcoin should be widely used and widely accepted, even if it doesn't replace fiat, no big deal, as people who are comfortable with bitcoin, will never use fiat.
Yes it does not matter whether bitcoin will replace fiat currency or not because its not practical to replace fiat currency but once more and more people start using bitcoin then it will become like credit card but the only difference is in bitcoin we will have control over our money and i am comfortable with bitcoin.