Mature altcoins are never dead.
Indeed, we have so many new coins added with premined, or hidden blocks, for pump and dump... The Bittrex thread gives some insights about what happened...
Junkcoin have none of these issues, and is mature... The price is low today, but who knows the future?
What exactly are mature alt coins? I only think 2 alt coins where successful for a long time and that was namecoin and litecoin. no other as lasting as long as them.
IXcoin is nearly 4 years old. Was launched right after NameCoin and unlike NameCoin, iXcoin has never died or forked and is just as secure as NameCoin.
Yet nobody knows about it. Very odd.
I hope that fair coins that are still out there and for a long time now; that are still operating, and still on the exchanges, will have a future.
The short term strategy that we see every week. A new coin is launched huge farms are already setup (they must already have the source code, and the pools code is ready), A pump and dump, and the the coin is dead, and the process is known as a a new scam coin. This strategy must have an end, they can't scam the same people every week; and now mining these coins don't worth the electricity...