The number and frequency of 51% attacks on blockchains is increasing. Ethereum last month being the first of the top 20 cryptocoins to be hit. Other types of attacks mostly try to exploit general weaknesses in how exchanges operate, but this is fundamental to how blockchain is supposed to work. Combined with how blockchain projects don’t seem to deliver and are basically vaporware, we’ve definitely gone from the peak of inflated expectations to the trough of disillusion. Whether there will be a plateau of productivity remains an open question.