The market is not only for one kind of product alone but for different products and people. Bitcoin cannot take the market alone, there must be other products and commodities that will keep up the challenge and competition for the market to remain busy. If we look at it closely, (I don't trade gold) gold trading is not as busy/occupied as crypto trading, this is because there are lots of coins in the crypto market that has the bitcoin pair, making the altcoins and bitcoin to be occupied and busy. Bitcoin will always be the lead of the crypto currency market, but cannot stand alone.