That's mean alternatively, if btc falls flat altcoin will dies off. What their deep relationship? Why btc important to altcoin, what's the connection in between? Will altcoins really survive without btc?
If fiat currency falls, nothing will happen to cryptocurrencies, if bitcoin falls, altcoins will suffer great injuries, some will die along because bthey may never have such opportunity to rise again, also if bitcoin should fall down completely, expect altcoins to have been in extinction, but i believe bitcoin will not die if if could sustain the rigorous experience over the fourteenth years of it existance, it has come to stay.