Yes, ethereum has definitely affected the market negatively.
But it is not the only reason.
I would say, the main reason is right in front of everyone's eyes: last bull run was too high too fast and totally unstable.
In simple laws of economics, supply shot way past demand and the entire year has been collapse.
Another thing that contributed to our current state, is the stock market crashing about a month ago.
We like to think that crypto is seperate from traditional markets, but that just isn't the case.
In fact, crypto is very much integrated into traditional portfolios, especially with btc futures.
erh does affect the market but not as much as btc does.
Ethereum is not the causes of the recent downturn on the crypto market. it maybe one of the contributory factor but it is not the main causes, you may review the issues confronting the dump of crypto.. it is believe that almost all coin are over sold, high market volatility, plus the never ending issues on Regulation, Scammed, Hackers, and the low confidence level by consumers. all of this contribute to contrary belief that Crypto will go up to roof just at the end of 2017 but the market goes down affecting all coin as posted on tje market. i am not comportable of such notion as Ethereum is the cause of recent down turn on the market.