I read all these threads about coins becoming officially dead. However, most of these threads are FUD. When does a coin become official dead? Is it when the developer stops developing? Is it when the coin stops trading on major exchanges?
A simple question that, given the range of answers, is not so simple to answer.
I think it is a good idea for us to converge on a definition that we can all use - there is enough confusion in this sphere!
I would say that a coin that was launched as a publicly accessible distributed network is dead when there is not a single pair of nodes running with at least one active on the wider internet. Other attributes of a dead coin are no available binaries and sources, no blockchain with blocks showing recent timestamps etc.
I don't buy the lack of exchanges or websites as a sign of a dead coin - some coins in a similar predicament have been rescued or taken over before.
In that sense, assets on a functioning blockchain can't die and private coins like Ripple can't be said to die. They can however be said to be 'withdrawn', 'depricated' or 'spam'. However this is my opinion - I am sure others will differ.