Some will be death forever, some other altcoin will suffer pretty bad but it eventualy will survive again. It happen many times during crypto winter. And dont forget, crypto winter is still be here untill 2024, buckle up and enjoy the ride. What comes up must goes down viceversa
Only altcoins that has been made as a scam coin that will be dead. Some bad coins still able to survive but it will be dumped so hard. People must aware if altcoins will able to die instantly.
There will always be some process before that will happen but if bitcoin die and everything gonna die too.