Wha?? How is something that flips up and down by several hundred percent over a given quarter-year going to 'align the exchange amount of currencies with real market value'? What does that even mean? Like the billion-dollar currency trading industry isn't doing that already, we need one more currency to get it just right?
You're describing how BTC looks today. The vision is that if liquidity is high (billions of transactions a day), then BTC could in theory replace all mediums of exchange between currencies. Today, for example, the dollar can be hedged because the price of oil, and vice versa. So we don't always get a true value of the dollar. (it's way more complicated than that, just trying to simplify) Additionally, using BTC massive lowers the barrier to exchange money (i.e. you don't need a bank). Banks make a lot of money (ever seen a "transaction fee"?) by simply moving money around.
But that is a chicken egg problem - with large price fluctuations no mass adoption, without mass adoption large price fluctuations. And except in comparison to the very early days (2011 and before) the price fluctuations did not get smaller over time.
