ICOs cannot die, as it is a new means of raising funds for the development of innovative projects. Probably the mechanisms will be changed to reduce the amount of scam
As long as there's still ambitious developers that will try their luck to achieved creating new project, ico will continue for more years to come, the business is really big if you are aiming for good earnings that's why many developers are keep on moving to penetrate new venue of coins, if they can be the first one building a system to a particular business then it can possibly grow, too early to assess whether it will die or not.