I think that we see a good example of manipulation.
Few weeks ago CEO of Bitmex Arthur Hayes said that Ethereum is useless coin with value under 100USD.
I believe that the market is being manipulated. I also believe that the price of Ethereum will return to $50-100 this time, but I don't think Ethereum is a worthless coin. Ethereum is only being abused by ICO to cause its own depreciation. But it will not disappear.