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.
Oh, Man! I can't imagine that any of this would make the boat more popular. On the contrary, it would probably sink (pardon the pun) the class. The H-20 is a technical, difficult boat to sail well. It's that challenge that brings people to the fleet. Why else would someone move up from a H16 or TheMightyHobie18, or anything else, if the 20 was less technical and less challenging?
1. When considering lighter weight, consider durability. The boat is already built lighter per foot than the 18.
2.See above
3. My couch is comfy and sailing skill is much more usefull in a big blow.
4. I'll pay for quality.
Don't change a thing. The boat is great the way it is. If you want to race one-design with a spinnaker, get a spin-designed boat. If you want to do distance races, modify a spinnaker for the 20, but any major class-sanctioned changes won't make the fleet more appealing.