Just to clarify, Terry, I wasn't trying to imply that that your class would be a hobbyist class.
Dave O commented regarding your trying to attract either older or non athletic students. What I was getting at is that while you may be in good condition and have advanced technique, the average student coming into your class will likely not have advanced technique and may or may not be well conditioned.
I'd wager that 90% of the people who engage in a martial art are hobbyists, so to a great degree, a school needs to work with that. A hobbyist will have different training goals from a hard core or very traditional practitioner. They may want the "tradition" in terms of wearing a dobok and dde, bowing upon entering the dojang, and the dojang etiquette that is typically associated with the martial arts. But they may work a day job and not be able to risk sports injuries too frequently or may not have the energy after a full day at work to effectively do martial gymnastics.
As I mentioned earlier, an older or indeed, elderly student will also have specific training needs that will prevent them from doing certain things, and likely martial gymnastics will be on that list.
Lastly, students who are over thirty may already be coming to you with a collection of sports injuries from football, high school wrestling, or whatever sports they may have participated in high school and college.
I'm certainly not familiar enough with Combat Hapkido to know how the curriculum compares directly to a traditional Hapkido curriculum, but I'd assume that a practitioner with your years of experience could take the techniques of the C/H curriculum and work them into a more traditional class.
I do agree: XMA/martial gymnastics doesn't by itself make you better at defending yourself, though it does develope solid core strength.
In any case, I didn't mean to open a can of worms by bumping this thread. I just happened upon Master Pelligrini in BB magazine and felt that it was of interest to the topic.
Daniel