What's the usage of Bitcoin outside the mainstream of the application such as in black market, gambling and pornographic dealing? I think all the applications above can make sure that the hard currency Bitcoin will not die, however, the true value of it should be shown after it stepping into the mainstream of the application.
Moving money across boarders is another genuine market right now, whether that be sending to friends/family or if you are travelling yourself and dont want to pay conversion charges to each fiat denomination.