The Hobie 20 is a really fun boat minus the spinnaker. H20 fleets are strong in the Midwest and up until last year could be considered the strongest in this area.
To attract more sailors to the H20:
1. Make the boat lighter weight. It is not an easy boat to lug around a beach with two people.
2. Automate some of the adjustments. Waves, H16s and Getaways are popular because they are simple. There are a lot of lines on an H20 and adding a Spin. isn't going to make it more popular.
3. Wings. I don't know if the "Euro-Wings" are avail. for the H20, but wings: A. are comfy & B. Help when in a good blow.
4. Price. The cheaper they can make it, the better.