I shouldn't have to point out the obvious here, it will clearly fall on deaf ears considering the vast amounts of stupidity revealing themselves in postings on this topic. But hell, if it brings just one person to their senses I'll count it job well done.
First, nobody is forcing anyone to hold their savings in US Dollars. You can hold your savings in whatever form you want, it's called a BROKERAGE ACCOUNT. Buy a commodity-tracking ETF if you desire, and keep just enough dollars around to service your monthly needs. The dollar, after all, is very definitely stable in the short-term. One month isn't going to destroy its value. Realize, though, the price of everything in real terms fluctuates. Someone who bought gold at $1900 is sitting on a 15% loss of value in dollar terms right now, for example. Real commodities generally maintain their value over long periods of time. Are you worried about buy/sell fees? If you are, then you don't have enough savings to even be AFFECTED by inflation in the first place.
Second, Bitcoin isn't a currency. It's a commodity with a limited supply. Not only is it a commodity with a limited supply but it is a VIRTUAL commodity with a fixed supply. It isn't even real. It's not something you can touch. It doesn't even behave like a currency fod gods sakes! It may not be possible to counterfeit, but that doesn't stop anyone from creating their own virtual commodities and competing. In fact, there are MANY virtual currencies already in existance, primarily used in games, which are already far more stable than bitcoin.
Third, Bitcoin's 'value' is fleeting. It's like tulip-mania but worse. It's worse because the market is so shallow it is trivial (and obviously trivial) to manipulate. Heavy manipulation by people selling high slowly, causing a panic, and then buying low. Rinse and repeat.
I'm guessing that a large percentage of the exchange volume is from rinse and repeaters and very little is actual investment purchases or sales. It creates the illusion of decent volume when, in fact, there actually isn't any. Each time it cycles the manipulators are removing more real money from the system, leaving everyone else holding the bag.
Think about what this means, folks. It isn't rocket science. Whatever cash was injected into the system by real investors is being leeched away by the manipulators. There is LESS real original cash remaining, yet all the remaining real investors believe that a Bitcoin is worth at least as much as they originally paid for it, because they see that magic exchange value in $USD 'Oh look, 1BTC is worth $166 BTC!'. What these investors do not understand is that they cannot ALL get that price if they were to sell. They can't get it even if they all paid that price going in because the manipulators have already squeezed out a considerable amount of cash from the system.
The very definition of a Ponzi scheme. This will only end in tears.