I think you need to have a strong team to make your project attractive and trusted by investors. Without a solid team, your project will fail. I am not sure whether ICO will succeed when investors or Bounty hunters no longer trust ICO. Maybe you need with IEO but as I said, You must have a strong and solid team.
Yes, I agree with your opinion on this topic, having a great team can make a lot of difference. Because behind every successful project there is a team that may put continuous effort until it gets succeeds. That's why it is a very essential part of having a productive team behind the project to make the project hugely successful.