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 so because if bitcoin falls majority of the big bitcoin users will go to the biggeat altcoin but these alternative cryptos doesn't have bigtime developers so it might not be stable and may shut down quickly.