We have the same problem in general aviation. For a while there were very few new pilots getting into flying. Much of it had to do with costs rising due to rediculous lawsuits. The manufacturers stopped promoting it and stopped building new airplanes.

Now new pilot numbers are on the rise. It took liability law reform and a huge effort by one of the largest general aviation organizations in the world (AOPA at AOPA.org ) to start a mentoring program. Granted teh costs are much higher with flying (That's why I started sailing... to save some money) but doing exactly what has been said here. Take someone under your wing and give them the sailing bug. Continue to be there to encourage them.