That should be expected as it is a natural principle. Most projects are dead because of poor management by the team members because they lack the expertise in crypto and failed to seek for counsel from experts. Also, projects with no backing product or tangible ideology behind is likely to go down the drain as it will lose the interest of potential investors.
Yes that is the one reason of dead projects the other reason is projekcts try to collect too much money for their product. They are collecting huge amount of money but their product can not make these kind of profits for years. So everything have to continue with hype in crypto for 90 percentage of coins. If we will look crypto with real world use case 95 percentage of icos should go to zero directly.