Ethereum price starts declining when ICOs started failing due to scam. We all know that majority of new projrcts us their platform that is why the demand for ethereum decreased. If this continue or if there is no further development on the ethereum's team part, ethereum might as well go down in ranking in regards to marketcap.
When most of the projects that fail and in funding using ethereum can indeed be one of the triggers of falling prices from ethereum because we many projects that fail and get so much ethereum they sell the ethereum assets and the amount is not small. so many lists of failed projects and huge funds.plus that this year IEO has become the main interest of investors. and the presence of IEO has no effect on ethereum