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I'm not sure it's dead per-se; it has reached a stable point in it's cycle and trading values are normalizing. It will go up slightly as more ETH implementations/payment solutions are adapted and the demand increases. As with any coin, usually early adapters stand to win big: shortly after the split of ETC and ETH mining still brought in daily fortunes - those who held on before it reached $1 instead of instantly trading it off should have amassed some potential wealth by now. Anyone who just got in (mining ETH) during 2017 merely made pocket change if anything.
Every crypto currency goes through these cycles; a coin either gets wide acceptance (Winklevoss brothers/Coinbase - LTC and ETH) due to the underlying technology and overall utility, or it goes bust and becomes totally useless (for example Bytecoin - not Bitcoin - developers premined 80% before releasing it to the public).
The GPU shortage isn't over yet either, as many other coins can still be mined. The prospect of having thousands (of units) of coins worthless today picking up trading value over time still makes this attractive to many. Just like Bitcoin (remember the 10,000BTC Pizza purchases from 2013?)
Which coins are going to be big? Keep an eye on trading platforms (BTC-e, Polyniex etc) and read up on the technology behind each coin.
The fact the world's 4th largest cryptocurrency exchange was hacked didn't help things either.