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?
In fact, one's opinion can be different here, but in my case, my personal opinion will be that Bitcoin's alternative coins are altcoins, since it is used as an alternative to Bitcoin, so it is most likely that they will not exist where there is no Bitcoin. If we see that due to the bear market when the price of Bitcoin suddenly fell too low, many altcoin projects could not survive and they had to disappear from the market. So I tink altcoins cann't survive without bitcoin.