Those that are delisted from bittrex and other exchagnes are basically not dead. They are either a security token or they do not meet the required daily volume for the exchange. Aside from that in severe case they are probably found out to be a fraud or scam coins.
They have their reasons why they are delisting it. I would say, better get rid of those tokens or coins as fast as you can because the likelihood of them dying is very high. Yes, small exchanges might accept them, but how sure are you that they can survive in the battle of crypto trading?