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.
I would also like to agreeing with you and like others I will also say that if Bitcoin ever failed or crashes it will be impossible to sustain the altcoin market. Alt-coin market are fully depend on bitcoin position if you saw that whenever we talk about bearish and bull run, we never talk about altcoin, always the analysis based with bitcoin, I will say that bitcoin is like the mother of the crypto world, and altcoins are its children, so the sustainment of altcoins without a mother will become impossible.