Today is still in a bullish period where most cryptocurrency will experience increasing prices or rates. However, I also feel the same that the dominance of Bitcoin is not as high or significant as in the past where the up or down price of BTC will really give significant influence to altcoins and make altcoins' price drop.
In this case, Bitcoin may still give a little bit influence when the price of BTC is going down, it will always drive the altcoins to go down again