Motocross has been killing itself ever since it started. They talked about it on that show 'Inside the Outdoors' in one episode. How kids need to be homeschooled since they travel so much. Parents mortgage/sell the farm to keep the kid in bikes and gear. All for the very slim chance of being on a factory team that actually pays a salary. Most riders, even in the pro classes, barely make anything. And then if you get injured? Teams can change riders like changing underwear.
Makes it very difficult to promote talent to the pro series. The series/promoters/factories need to find ways to support the amateur ranks better. It will make for a stronger series in the long run.