It would be great to be able to identify the features necessary for successful entrepreneurship. However, defining "tenacity" and "scrappiness" (and other latent variables) in a binary fashion acceptable to a bureaucrat are difficult. In its absence, use something like the YC approach (interview by experts) to determine the success of an idea? If 1 out of every 100 people succeed, you have 1000 jobs for U.S. citizens.