if it does not become mainstream then when? Even you can hear it in Big Bang Theory, and all of Bank start to give warning about, is it not mainstream enough?
I love the BBT, but I didn't notice they speak about crypto currencies there. Maybe in some new episodes that I didn't watch yet.
I think bitcoin is only becoming a main stream. I was reading that only 2% of people know and use it and it is actually really few. But there is no doubt that such huge price like today will attract much more users in sooner time
