I don't think Ethereum will fail. It falls because the entire market falls, besides Ethereum is highly dependent on Bitcoin.
Unfortunately, it is true that Ethereum price depends on the price of Bitcoin. The cryptocurrency market will start to function normally - just like the other currencie markets when it changes and the altcoins prices will be set regardless of the price of Bitcoin. Ethereum has enormous potential and I think investors will understand this soon and will invest in it regardless of what happens to BTC. When will it happen, the price of ETH will go to the moon!