Yes, but this can be addressed with better budgeting, and possibly an exploratory phase or doing a huge project in steps made of small projects. The point being it isn't inherent to the nature of Kickstarter projects, that only a few succeed.
You make it sound so simple! If all projects were addressed with better budgeting and done in steps made of smaller projects, software projects would never miss a deadline. You should email Fred Brooks about how you just discovered the solution to his Mythical Man Month, maybe you'll even win a Turing award for your insight. </sarcasm>
You don't have to hit every deadline on the nose for a successful project. Nor am I saying every project can succeed. We're getting off track here; the point is, I just think that success rates on Kickstarter projects are not inherently related to the success rates of startups.