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.

this is not necessarily. because it could be overtaking Bitcoin Altcoin. but the chances are small enough. and by seeing the development of all coin, death will not come. because each development team will attempt to restore their situation.