bitcoin

A lot don't understand it yet and most who do, do not use it as payment since it's too volatile. Bitcoin is more of an asset like gold, digital asset to be exact and most who know or have it just hold on to it as investment or buy and sell it at an exchage when prices go up. Just recently bitcoin split to become bitcoincash because there is a sector that wants to use it the way you described as money, one thing I would agree with you is it is growing, not just bitcoins but other cryptocurrencies as well

Not everyone. Maybe only one out of 100,000 but it's growing.

Not everyone I think, but many do already. The idea of cryptocurrency, despite it being really popular now, is still a stranger to some that they wouldn't risk their hard earned money. Who would if they don't really know how it works? I do mining and trading of it though and I earned quite a lot from it.