In the history of bitcoin a lot of those glorious gains from 2011 to 2013 was greatly influenced by the black market activity of silk road taking on a rocket ride from
1$ to 1000$..
But look at what is happening now!
White markets merchant adoption is increasing, new egg, overstock and the list gets longer much because companies like bitpay want to increase the merchant base for bitcoin!
Though this is great but what do these merchants do? They just sell off bitcoins immediately for dollars and this creates a selling pressure and hence bitcoin keeps falling which made
2014 the worst year for bitcoin in terms of price gain!
If bitcoin keeps falllling like this then people become less interested in bitcoin and avoid it and hence no more merchants will accept bitcoin and thus the whole system just comes to a point of failure.
But black markets even if they increase the price of bitcoin many folds, may on long run make the mainstream public to hate bitcoin altogether.
So the question is which is going to take bitcoin to moon, is it future decentralized black markets or centralized white markets?