Earlier quoted context omitted.
You are talking about day-to-day spendings. I don't understand why fixate on them. They are a very tiny blip in most people's finances. I manage to live most ordinary days of my life without spending any currency. What I care about is raking together money for realty, and otherwise preserving money for the day when I need them. This is where bitcoin is a viable addition.
My rent, my car bills, and my groceries aren't a tiny blip in my finances. So far, none of them have a fixed bitcoin price. I mean, I suppose I could do the hip thing and live in a homeless hackspace, but I don't think that would be considered normal. Also, it's bit cold for that outside the Valley.
And savings I save.