Yes, the dominance is dropping hard but still the Bitcoin remains the most dominant among the cryptocurrencies there is.  We cannot predict what will happen in the next few days or months.  People have predicted last November early on that the Bitcoin will have a price of US$ 10,000 at the end of the year 2017, but it was more than that, it even reached the price of US$ 20,000 during the period of December 2017.