If it doesn't, then what gives it its value? Having it literally represent work rather than the existing USD --> Bitcoins --> Goods or services (still denominated in USD) is the crux of the problem here. Everyone is concerned about the exchange rate to USD, as they should be in the existing system; since Bitcoin isn't implicitly 'backed' by productivity it seeks to find something that is, in this case USD.
This is a (not the only) primary fallacy of Bitcoin.
If the "coins" would instead represent hours of work, for example, I think it would be a much improved system. Of course how to determine pay rates for labor of different value would be another challenge, although it would invalidate the need to be 'backed' via USD.
The USD also does not represent any work achieved, it is not backed by gold and every day it is typed into a computer out of nothingness. People are concerned about the price of BTC to USD not because BTC has no value of its own but because they pay their rent in USD (or whatever other fiat currency). BTC is new and a critical stage will be the time when people start seeing a value in BTC vs. their groceries but it won't happen over night and is probably still many years from this shift. With every passing day however BTC gets closer to this goal, with each new person brought into the fray and each new business seeing the value in accepting this as a currency the pivotal moment where people see the price of goods and services directly gets closer.
Once these coins are seen directly as their value in goods and services then you will see the coins representing hours of work, this is how all currencies came to be in history, even gold... it didn't just magically become a currency.
This is a time and patience/persistence issue, not some underlying flaw in the currency. Can Bitcoin be improved? Yes, and people are working that in several ways but fundamentally it is a very sound system.
It's challenging when your ideas aren't some regurgitation of something you've read, it makes you have to explain things in such exhaustive detail that people don't want to read it; the alternative is of course to try to be brief to which people read into what you posted all manner of things neither said nor implied or simply point out what should be obvious to all. Maybe this will be solved if I get a time to write a book. =]
I'm not flaming you mind you, I'm just complaining in general that I'm unable to strike a balance between detail and brevity that is going to please everyone on this forum.
Unto your post,
The USD actually does represent work achieved, at least in a much larger proportion that Bitcoin where literally every new 'coin' issued is for doing non-productive 'work' of 'mining' 'coins'. Sure, the existing system is abused, of course, but I'm just showing you the framework that is the issuance of currency. Central banks have, as well as private banks, fund useful work. If you wanted to go get a loan to do something pointless that wouldn't yield any useful function (and therefore no profit) I'm sure they wouldn't give it to you. This means that these currencies are 'backed' by work/labor/productivity/useful-work, that money will be issued into the system for something worthwhile. Of course with the deregulated banking system and 50-to-1 leverage and inter-bank lending this system is presently a madhouse, hence the social unrest and immiseration of the population.
What you're missing here is that even if the 'currency' that represents BTC took off and became widespread it would still function as what it is: a virtual commodity. It would still be denominated in dollars. People would still check the value of BTC to USD before trading anything for it. That isn't independence, it would be much like Gold, where we say it is increasing in value because we are valuing it in USD.
I'm saying that unless this system can somehow directly represent work performed (which is a radical change from how existing BTC are brought into the system) then I don't expect it to really ever be adopted as a 'currency'.