it's completely different matters,
every altcoin will die if Bitcoin is not exist anymore,
and altcoin will survive if Bitcoin survive,
Bitcoin alive = altcoin alive
Bitcoin die = altcoin die
even if Bitcoin alive,we still can see an altcoin dying.but it's not related by missile or some stuff like that
I don't believe that if bitcoin dies altcoins will die. I think many have taken on a life of their own already. If you don't think so, you must not pay attention to all the different altcoins and there amazing projects worth millions or even billion of dollars. Don't get me wrong, there is a strong price correlation between bitcoin and the alts, but bitcoin is like the CEO. Everyone thinks the CEO is running the show, but really he just takes all the credit.