Although this is the definition of legal tender, I would somewhat doubt that this would happen because of the fact that so many people (a smaller percentage every day) do not know what bitcoin is and a larger percentage (most people) do not know how to properly secure their bitcoin.
That's not a reason for it not to happen.
This is the classic one: bitcoin can't be used until there is adoption; why adopt something that nobody uses?
It has to start somewhere.
Since when do people know how to secure their money (be it a CC or cash)?
