If a cryptocoin depends on an exchange to make it live or die, then it does not deserve our time and bitcoins. A cryptocoin should depend on its own community. Without it a real community, then it should die.
Developers should also be dispensable. Read about the history of Monero. It became more progressive after smooth and others deposed the founder.
I don't think you understand the scope of what Cryptsy "closing", and they way it closed had an effect on the coins. At the same time, I don't really know if any of those coins have a hope of coming back, aside from maybe the name.
Back when Cryptsy was around, it was the largest and best set up altcoin exchange. I think it at least felt bigger than Bittrex, it had more coins for trade, and people were more naive, as nothing of that magnitude happened before. Everyone knew that Cryptsy was making a fortune on trade commissions, and thus alot of people felt safer keeping their coins on the exchange.
Cryptsy didn't exactly "close", in the normal sense. Instead Big Vern stole the coins stored on the exchange. For alot of the smaller coins, he was probably holding onto the majority of the coins in the blockchain, thus being able to kill a coin because of an exchange. Nothing the Developer or the community could do to save it, aside from maybe a total reset of the blockchain.