By definition these 10,000 founders wouldn't be taking jobs from Americans: it could be part of the terms of the visa that they couldn't work for existing companies,
This is a good idea because the expected outcome of adding 10,000 new people to the "pool of workers" by existing companies would be to see an increase in unemployment claims (even though not all unemployed people would file).
So by adding 10,000 Founder Visas to the pool of workers and then tracking the rate of decrease (or increase) of unemployment, a metric of immigrant-based job-creation startup foo could probably be determined.
This is a good idea because the expected outcome of adding 10,000 new people to the "pool of workers" by existing companies would be to see an increase in unemployment claims (even though not all unemployed people would file).
So by adding 10,000 Founder Visas to the pool of workers and then tracking the rate of decrease (or increase) of unemployment, a metric of immigrant-based job-creation startup foo could probably be determined.