How about having over 300 compliant boats around the world already
Are you kidding? How about 30,000. In addition, trying to get manufactures to produce a boat specifically for youth sailors would be a tough proposition in an already crowded market. Why reinvent the wheel. This isn't America's Cup here The youth boat should test fundamental skills, not the sailor's thrill threashold.
I think that seeing the world's best youth sailors on a boat that so many young people have access to gives the up-and-comers something to easily identify with and will do more to generate interest than the latest, greatest, unreachable rig.