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But it is not that black and white, is it? While it is quite clear that Bitcoin has "value" as long as people are willing to trade it (i.e., indefinitely), there is still no reason to assume that it will ever stop having these extreme fluctuations. To the contrary, I'd say that, as time progresses, we observe Bitcoin having the same problems that the gold standard had, mixed with an additional proneness to speculatio…
The value of a currency lies entirely in the perception of that value. I don't consider bitcoin different from a traditional currency, except that its rate of production is known in advance. It will keep having value because by now enough people think it does.
There is also a second problem in that BTC is deflationary by design. Deflation leads to hoarding of currency units while reducing the velocity of money and suffocating the economy. Most people will agree that deflation is the worst thing that can happen to an economy which is why central banks will do everything in their power to avert it. It is hard to imagine how a stable Bitcoin economy could develop under these inherently flawed circumstances.