Dead coins don’t just come back to life. If developers are nowhere to be found and it has been delisted from every exchange, it is time to give up hope. Depending on whether it is the native blockchain itself that is dead or just a token built on a chain, there could be major security issues. It would not be very expensive to do a 51% attack on a dead blockchain.
Usually, before a coin dies, there are warning signs and this is when you should have cut your losses and dumped it. I have not seen a successful revival of a dead coin, but there are some coins that are running on life support that keep going for many years. I wouldn’t count on them making a comeback and would just look for a way to cash out if they still have any value.
Of course. The odds of "reviving" a "dead" coin are very slim. You're better off moving to newer and popular coins. Still, that doesn't mean a "dead" coin can experience bursts of market activity from time to time. Sometimes a buyer makes a few purchases on the exchange for a "dead" coin, effectively "pumping" its market price.
You'd be lucky to sell before interest/demand is lost again. Believe me, I've seen this happen a lot on YoBit. There are too many "shitcoins" that sporadically experience "pumps", making this a great opportunity for profit. Still, this is more of a gamble than anything else. For a serious long-term investment, choose Bitcoin instead.
