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.
That's like saying no one needs a cell phone or the internet or a car. No you don't need these things but we have them for a reason, right? It's a matter of looking at things with an open mind or from a single perspective. If you don't want to miss out on the opportunities life gives you just don't listen and learn.
I for one try to do more listening and learning in life and less talking, but I think like all things there needs to be balance for it to work well.