This is true...however we have no idea what could happen before then. I mean, Something amazing could come along and completely destroy bitcoin to be worth nothing.
More things could crash like gox and make it so unstable that it just plummets...
Unlikely, because of first movers advantage, the ability of Bitcoin to incorporate new features if needed, the network effect, and the reality that if Bitcoin fails it will question the credibility of any other decentralized crypto-currency. Bitcoin is too big to fail in the best possible way so we should jump in and make sure it stays pure and used as originally intended by Satoshi.
but.... they call it a "black swan event" for a reason.....
My philosophy is I don't care about the potential risks of a black swan event because my motivations are far beyond investment and mainly ethical and philosophical in nature. This may initially seem to be unwise and irrational when it comes to investing but is also precisely the reason bitcoin will succeed: Their are many of us that believe in it and will not allow it to fail.