Bitcoin is not currency its a digital collectible. It is the equivalent of a digital baseball card. A lot of people around here dont see that as a problem, but if your goal is mass adoption or price stability it's a massive problem.
Your analogy makes no sense to me. If you compare bitcoin to a government backed currency whose use they enforce then yes, it is probably harder to convince someone why they should use it.
Either you want massive external control and intervention (then you
might get your stability and possibly adoption) or you want something decentralized and have to accept that your control options are limited.
Value always lies in the eye of the beholder so although you may think your precious paper bill of legal tender from country a is worth x, it is only because the current circumstances make you (and others) believe so.
Just look at extreme situations such as natural disasters etc. Suddenly your currency might be nothing more than a piece of paper, a collectible, yet that bottle of fresh water becomes a desirable trade good.