I think the hayday of ICOs was 2017. At least in the form they are currently taking. It was the wild west, which is fine, but the market will bring it to order. People are being slightly smarter about what they are throwing their money at. They arent putting money just into a good whitepaper anymore. Crowd sales are less of a thing it seems. Just a bunch of big private sales. There will still be more ICO raising huge amounts of money, but I think they will be less and farther between each other than they were last year, and people will have to try much harder to get that money.