If you want more people to join you in racing then you have to recruit them. Windsurfing is a dying sport too. But we have free or low cost clinics ( Learn to Windsurf Day on Lanier ) that bring in younger people. Kiteborading is the new glamor sport. Everyone is heading in that direction.
I have been sailing Hobies for years and after beeing out of Hobies for about 8 years I am now back. When I announce to my dirt bike buddies about my new Hobie purchase they say, "What's a Hobie Cat"!
If you want more people to race you have to show them how it is more fun than work.