Makes you ask the question why jumps are needed anymore. I get horse racing, but not sure obstacles are needed really after watching race 1 today. Horrible viewing.
The biggest concern is, Sir Erec's leg break came over "just" the sticks. Wasn't even a full on hedge. For me proper jumps, obstacles, hedges etc. are technical elements reserved for calculated skill in Equestrian. Where both the horse and rider have more time to assess a jump. Equestrian is like the equivalent of a High Jumper, Pole Vaulter or Vault gymnastics. Yes there are still risks and injuries but they can be minimized.
In Horse Racing there is so much power and speed it would be like asking a Sprinter to jump over a 2m (6'7" ish) high obstacle and then get up and keep going at the previous pace. This is what makes Horse Racing so much more technical I guess but the industry hasn't really caught up. A real equivalent would be in Motor Racing (whatever the opinion of the status as a sport) where they have put in place so much safety yet (if you're a fan) it can still be exciting, and still accidents happen.
Maybe the Horse Racing industry are a little scared of making it boring but if both Darts and Snooker can have revivals then i'm certain there will always be a place for Giddies. No matter how safe they make it. The bottom line is, there aren't many sound humans that want to see a shattered horse tibia.