To me if we are looking at replay of 2013 when it went to 1000 and back to 100, then we are going to see a major low around 1000-1500 for bitcoin which will take the whole 2018 to develop.
This will also be time for other cryptos to complete their short-term execution plans and prove their viability.
RE: What's a realistic market cap? 1/5 millennials will hold crypto?