Most alts are still very dependent on btc, the movement of bitcoin either forward or backwards in a way or to affects also the movement of the alts.. So I think btc will still remain king.
I think now I see the bitcoin price movement is very slow, there are actually a few coins that I see price movements start fast. One of them is the altcoin, for that I predict that there is a possibility in the future that altcoins will be able to control the market and beat bitcoin.
Until now bitcoin still controls the market, but I am not sure that bitcoin will forever control the market.