There can be many factors that dropped the market down recently, but if we watch is as a whole ( the change for the last 30 days ) we can see that we are still really good on the graphs. Anyways, after such a huge blast the correction was needed obviously.
We can only expect for the better and I predict the marketcap to be at 1 trillion by the end of february 2018. It's just time needed for mass adoption and the market was being manipulated/ a lot of newbies in the space sold everything when they saw a little down spike in the markets giving space for whales/banks and new investors to come in the cryptospace in this discounts season.