The popular opinion seems to be that Core's refusal to lift the 1MB block size has put an early, artificial cap on adoption. I don't know how true it is...But the market is rarely wrong about these things.
Whether or not it's put a cap on adoption, it certainly seems to have put a cap on the price.
Interestingly, there is an analogous problem in the capital markets at large right now.
Stock markets have come well off of their Summer highs. There is evidence that the global economy is slipping into recession if it isn't there already.
Central banks don't seem to have a clue about it, and don't even acknowledge the possibility going by the FOMC statement today.
OPEC countries are being killed by the collapse in oil prices, but can't agree on production quotas.
There is a general breakdown of confidence due to incompetent, ineffectual leadership across the board.