If you can develop a vector that affect every cell in the body, including neuro tissue, the technology could be used for more than Down syndrome. Given that the vast majority of Down pregnancies do not even make it to term, there might be a much larger market than meets the eye just for Down syndrome alone as well, especially if combined with preimplantation genetic diagnosis. And there appears to be a larger and larger body of medical work going overseas, along with "medical tourism" on the rise to places like India and Brazil where US/EU certified docs can do procedures (or even read images!) for a fraction of the cost and live *quite* well. Nightwing, anyone?