Wrong, i disagree with you, things don't work like that way you thought, bitcoin has always been volatile right form the onset, altcoins are not what determines the volatility of bitcoin, don't get the wrong concept, if altcoin ceased to exist, bitcoin will still remain volatile, if you could check from the history of bitcoin, most of the market reactions were driven by the market price of bitcoin through its volatility, maybe you have to understand that bitcoin was the first ever cryptocurrency we had, and everything you see in bitcoin today has been in place right from the beginning even before altcoins were introduced.