No one really NEED bitcoin, isn't it? you just want to buy some coins and wait for profit, and sell them at 1000or 2000 USD, and get the money out. No one need it as a currency, people buy coins only for speculation, to sell them to another idiot.
Now, there are no more idiots come to this game, and the Ponzi scheme will be over, and everyone in it will doom to hell.
You are right as a beginner everybody has the same assumption but as you get to know it's usage advantages there is more than just speculation and profit motive.Moreover a challenge to the financial elites