As we all know it when bitcoin price goes down, most of the coins are heading down too. That's because bitcoin it is the Heart of all coins if its sound then all of the coins are good, if it's Bad then all of the coins are going down too. most of the time other coins are following the bitcoin price. just look up the market right now.
No, I don't think like that. It affects each other and bitcoin is more dominant in influencing, but one day, if there is a real breakthrough in using blockchain, I think bitcoin will not be used again as a common payment tool.