As I see it there are two factors that depend Bitcoin's future value. 1) If it will be actually usable for transactions, and 2) if the volatility calms down to a level where one can actually put money in it without being completely uncertain of the returns. Right now it is just a speculative object, where you invest in the hopes of someone else buying it for more. That is not sustainable, and it either calms down or it bursts. There is definitely value behind it, but it will have to redevelop if it bursts.