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.
I'm sure the ICO will be alive. But in a new way! There should be fewer projects, but it will be really high-quality ICO. Which will offer a working good product. And people will not be afraid to invest in these projects!