I don't think shitcoins will go forever if cryptopia dead because there are many other exchanges that they can try to add their coins and get more fans. The developer will search on the other exchange, and if they can prove to the other exchange that their project is legit, then they will have a chance to get the listed on that exchange.
I meant only the shitcoins left in the exchange that people didn't withdraw before the hack. I know a lot of shitcoins can still be traded in other exchanges