The ico trend follows the market chart, if there will be a big bullrun to create alot of FOMO and that will push the ico market at the same time. Remember ico market depends on the hype and that will be so easy to take a conclusion if ico market was following crypto market.
I am not pretty sure for this if the success rate of every ICO depend on the market trends. If the team has a good, positive and confident in promoting the project like having a good strategy, connections and good marketing may not be the reason for a project to fail. It is just that investors are not trusting already the market or any ICO projecta because of the number of scammers and a scam projects.