Well my experience is that yes, Saddlebreds make amazing trail horses. Of course each one is an individual and training is needed as with any breed (states the obvious) but yes, if you find a horse out of him for trails, have a look.
Many long years ago, I was asked to go trail riding with some friends who had other breeds of horses. At that time in my life, I was into showing and had not experienced much trail riding. They told me I could ride one of their horses but I said, "no, I will take one of mine." Anyway, off I go on one of my mares with a flat saddle to trail ride with my friends on their Quarter horses. Along the way, they were teasing me about my horse as she was snorting and blowing though not doing anything at all wrong. She was just excited with all the new sights and sounds. Well all of a sudden a deer jumps up right in front of us and my horse parks out and snorts really loud at it. I just sat there in amazement that we were less the 6 feet away from this big deer and it seemed shock to see us. It seemed like 5 minutes but was probably 1. All of a sudden the deer ran off and I looked to my friend but she wasn't there. I then realized that not one but ALL of the wonderful Quarter horses had spooked and a few bolted off. When the troops regrouped, it was me that got to do some teasing. Ha ha I have to admit though, it was that moment that made me fall totally in love with trail riding and I have never looked back. I love the relaxation of it, I love how happy the horses are, I love the sights, sounds and smells. :)
Keep in mind that my initial "not loving" the horse you posted was more from a "park horse" view. I see no reason why a horse from him couldn't be a beautiful trail horse, assuming the temperament is right and it is properly trained.