I have a few nuances that, although they do not say that the market will behave the same way as last year, but surely will prompt what will happen to it after a while:
 -The impact of bitcoin grows, which indicates a gradual realization by the market that the leading crypto currency is reliably protected.
 -Rally 2015-2017 was historic, but not unique in this ecosystem: from the end of 2011 to April 2013, the price of bitcoin increased 100-fold, and six months later-another ten.
 - Approval of bitcoin-ETF, even with a delay, could be a significant event, as it will make the asset extremely affordable for retail investors.  After the launch of the first ETF for gold in 2004, the price of precious metal increased by 350%.  The 2017 rally also caused a wave of corporate activity around bitcoin, and the promises of well-known banks, brokers, payment services and security service providers attract investors' attention using a value strategy.
  What also says that in the near future is unlikely to be a big increase in crypto currency!