Bitcoin can die because of a stronger altcoin (in far future). The fate of other altcoins depends on reasons why bitcoin died.
No. It is not correct. Bitcoin may die, it does not mean that all coin will die.
You are both WRONG.
Bitcoin cannot die.
Alt coins are NOTHING without bitcoin.
You can buy houses, cars, coffee, food, online services, online goods ONLY with bitcoin or ETH,, NO OTHERS!
So Altcoins are ONLY worth anything at all, because you can trade them for bitcoin or cash.