In fact that prediction seems quite conservative because if we take into account that the bitcoin started the year with a price around $13,500, that would imply a performance of just over 350%, which is ridiculously small compared to the performance of almost 1500% last year, and to the average performance of the top-ten cryptos. It is true that perhaps the market is sufficiently suspicious to expect an increase to $100,000, but this market is essentially unpredictable and surprising, so that such an optimistic scenario can not be ruled out either.
What people seem to forget is how low the actual money flow in this ecosystem was before we entered 2017. The sudden massive increase in adoption resulted in this market to experience more capital inflow than ever before.
That very well explains how we so easily could have gone up like 20 times within 12 months. It was just buy buy buy, sell, buy buy buy buy, sell, buy buy buy buy, sell, etc. While new capital came in, early entrants were stepping out.
A lot of these early entrants stepped out too soon, but you can't really blame them for that since no one could have ever expected the market to almost reach the $20,000 mark. It happened spontaneously.
It was an amazing achievement, but unfortunately not one that lasted long.