Any good ATC should be able to get CSCS certified without too much trouble. You're right though, ATC isn't all that new. It's just that it's a very specialized field that few really understand what an ATC can do. I have a Bachelor's in Sports Medicine. I know what they can do. I'm also a Paramedic. Guess how often I had to "crack open the book" in P-school? I've also RARELY had to do the same in RN school. That's not to say that those schools sucked, rather it's a testament to the educational depth I'd gotten through the Sports Med program.
As an Athletic Trainer and Paramedic, I'd love the chance to legally combine both of those skill sets. Unfortunately, that doesn't normally happen. Otherwise, there'd be a ton of ATC/Paramedics working at the pro-team level that could handle nearly all the care needed from point of injury through arrival at the ED without handing off the player to someone less educated, or changing legal "hats."
About 40% of all ATC's work in High schools, supporting their athletics programs. That means that most of those ATC's pull double duty as a teacher and only get a stipend on top of their teacher's salary. In the clinical setting, the ATC often is only allowed to perform duties similar to a Physical Therapy Aide, even though their knowledge and skills are much closer to that of a Physical Therapist. It's not uncommon for an ATC to continue their education and get a Physical Therapy Masters and get licensed as a Physical Therapist. There's much more money in that, though the PT/ATC then spends most of their time in the clinic doing rehab than injury evaluation and prevention.
During my AT time, I spent a LOT of my time doing prevention and worked very closely with the team's Orthopod. It was really fun working with him, not to mention, educational. Do I know how to tape? Yes. It's a very small part of what I did.
As an EMT, I made more money than I would have as an Athletic Trainer in California, unless I was also a teacher or a Physical Therapist, or I managed to somehow get hired by a college/university/pro sports program.