I'm sorry to say this and don't get me wrong, but motorcycles are dangerous. Plain and simple. Have you watched supercross or motocross? The riders are absolutely amazing athletes and what a beautiful sport motocross is, but there has been and there will always be horrific injuries - no matter what they do to the rules. It sucks, but I guess every rider accepts the risks while they sign up for a race. Unfortunately, same applies to trials - once Gelabert sent that Sherco wide open to that crazy section and broke his face, he accepted the risks before the first gate and went for it. Unfortunately I don't see any ways to change that, at least not as long as Bou keeps dominating the series.
This may sound dull, but what we are witnessing with Toni Bou right now, is absolutely amazing and something we will never see again. A rider like that is born once every 50-years, if even that. If you don't want to see Bou out there "ruining" the sport for every other rider, you should speak directly to Honda and recommend them to pay a seven figure amount of Euros for Bou to retire. Bou is the Ricky Carmichael of trials, and a bit more. RC did two perfect seasons in the AMA Nationals back in the days (winning 24 motos out of 24) and "ruined" the sport for anyone else.
I just don't see any way out of this situation right now until Toni retires. By making the sections easier and safer, you make Bou go 0-0-0-0-0-0-0-0-0-0... That would suck even more than the current situation.