Agreed with you, as most of the ICOs use Ethereum contracts. At current ETH value is low but in short time it will regain its high value & will rank as king of ICOs.
In any case, Until today, the ico market of companies has shown very good results thanks to truly amazing projects that used the erc20 platform. I am sure that ethereum has very big prospects in the future and that ethereum will obviously claim to be the leader in the cryptocurrency market.
ethereum will be very strong during many time and still i think that this king will not stay at this place forever and it will be replaced