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.

Bitcoin is a popular crypto currency no doubt and i don't believe that Bitcoin will ever dies and if eventually dies it will be really difficult for altcoins to survive since many of them has a different term and technology.