I dont think bitcoin will bring losses to investors. The price will rise in the long term, even if crashes occur in short term. People tend to get too much speculative and end up panic-selling everything and the crash happens. However this is again short-term, in the long term the price will keep rising and they will make profits.
Actually it did, and it is not by tens, but by thousands. The fact, those who bought at more than $1000 way back the end of 2013 is still at a lost at this point, and those users of hacked MT GOX that has lost their bitcoins had yet been recovered. IF you consider the price of bitcoin when it was at its ATH upto this point, I don't think it is a short term crash. I agree bitcoin is inclining but for the perspective of those who jump into bitcoins when price was too high, it is a different story.
I would say to make all believe that bitcoin is a profitable venture, it must exceed its ATH so that we can say to those who bought at ATH, bitcoin is indeed a good investment.