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 last crypto to die is Bitcoin,, though its the oldest I think nothing can beat bitcoin because of its popularity.. most altcoin holders or Eth holders trade their coins to bitcoin..because they believe in the potenial of bitcoin rather than their own coin..