Bitcoin is a very popular crypto coin today, we know that Bitcoin will be very expensive in the future but I imagine if Bitcoin die, whether there will be hope for the future of altcoin? because most altcoin exchanges are to bitcoins
your opinion is highly appreciated.

I think the altcoin will not die, but it is likely that the prices of all markets will be red forever. I hope that is when ETH will replace Bitcoin and will be a new king in the Crypto market. I think so