I suppose that ICOs in 2018 will move to a new level. The amount of project will be reduced, but the quality should be improved for sure. Moreover I guess that in 2018 ETH will share the place of the top ICO platform with NEM, NEO and other projects.
If the quality of the ICO is not reduced, there will be very few investors willing to join the ICO, 2017 is a year of ICO boom. But 2018 is an ICO year that can not grow