Bitcoin still dominating its value, though investors have a lots of choices where to invest, there are many sprouting ICO's and another potential coins to invest, These may be the factor which affect the sudden downfall of btc value.
Popularity of bitcoin did not really deminished, really true that many alternative choices coins keeps puffing up but that it does not changed the fact that it is still the most popular. Why? many reasons:it is decentralized and uncontrolled, almost risk free, easy to use and setup, you do not need names to create accounts -you're not known, it also records everything even to the smallest transaction done.
There is an article I have read: https://www.newsbtc.com/2016/02/27/bitcoin-continues-become-increasingly-popular/ , this may help
