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.

yes, if it really ahppenm bitcoin dies, then all the price of all altcoins will drop too and lead to the end of altcoins era, it will be gameover, but i think altcoin will last longer about 10-15 years ahead , even the price will rise again soon