I feel like this can go one of two ways in the short run. Either AWSA drops regulations for tournament boats so that more personal boats are eligible, or something changes with promo boats.
On the regulations side, my feeling has always been that the main purpose of ZO is as a homologation tool. If your boat was AWSA certified WITH ZO as the speed control, and your boat can have the latest ZO version, hypothetically it should be able to pull any tournament. (I am sure i will catch flak for that statement but something has to give eventually.) Obviously the biggest problem with this is that regions with less promo boats will have more older boats pulling tournaments, while places like (florida) are more likely to have all new boats.
On the promo program side of things, how have the number of promo boats tracked the demand for ski boats in general over the years? Is the lack of promo boats a problem with program design or is it a symptom of what's happening to the market in general? In my mind, everything in this sport is very related. As a collegiate skier, a lot of the kids I ski with plan to buy ski boats after college. Certainly not new, but you could bet that many of them will be able to afford a new one ~relatively~ soon after graduating. But how many of those kids will stay involved enough in the tournament scene to have incentives to buy a new boat. We all love/want the new boats, but in reality, if a skier isn't skiing in lots of tournaments/competing to be on top, there are significantly diminishing returns to getting a new boat. Less people skiing -> less people wanting new boats all the time -> factories having less money to support promo programs -> less people skiing behind the newest boats -> continue cycle.
SO i guess my point is, is the promo program where the change has to break? Or is it a problem that is more easily solved by fixing the rest. In general, skiers want the latest and greatest. If lowering requirements for tournament boats helps more tournaments happen, and more tournaments helps increase involvement, then eventually there will be more demand for new boats. More skiers in general give a better chance of more people wanting to do promo. More demand for boats gives more money for factories/dealers to support promo programs.
Idk, just my crappy take on things.