I was looking at ETH and as far as I understand, this coin is mainly successful because of the ICO's nowadays.
ICO's are booming and it looks like it never ends. But what if all ideas are gone and the amount of new coins which use/ need ETH are decreasing. Would this have much effect on the price?
Maybe someone can correct me if I am wrong?
Yes, what you say is very reasonable. With the recent rise of the ICO on the blockchain Ethereum, traders and investors have mixed views on the impact of this fundraising method on mathematical prediction. Many argue that these tokens will promote demand for their base currency, is Ethereum. Almost all ICOs are stored on the Ethereum blockchain because of the simple fact: With the ERC20 standard, this blockchain provides seamless and easy tokens release through an intelligent contract. I think this may be the reason many people hoard ETH and invest in it and promote it. This is just my opinion.