Archtkd
3rd Black Belt
I'm fairly certain this has been discussed before at some point, in this thread or another, but there seems to be a perception that the majority of taekwondo schools are "sport" schools. I could certainly be wrong, since I can only talk about what I have seen, but in my experience, "sport" schools are rare. I think a "sport" school is a niche thing, maybe even a bigger niche than a self-defence school. The overwhelming vast majority of students I have come across have had no interest in competition, and absolutley no thought of ever competing in the olympics. Even the schools I've seen who compete a lot have had a relatively low % of students who compete. If I had to guess, I'd say maybe 80% or more of the students don't compete, or compete only recreationally at small local events. I've only heard of a few schools that teach only "sport." And those schools are small groups of elite students who want to train in a more competitive environment than in the general student body of a normal school.
So, to be on topic, I don't think there are many "thriving" sports schools out there, because just like a SD school, the numbers will be small, by design.
I tend to think of the pure taekwondo sport schools as finishing schools. Those are operations that only admit students with prior experience, usually young athlete blackbelts, who want to specialize in WTF sparring. I don't think someone like Juan Moreno, for example, enrolls beginners he has to teach the basics. Some highly specialized self dense dojangs are or really should be finishing schools, where people who already have a solid taekwondo foundation, preferably blackbelts, would go to learn specialized stuff, and stuff they could use regurly in jobs such as security guards, body guards, law enforcement folks, etc. There is a place for the finishing schools, I mention, but the idea that they should or can be for every taekwondoin is misguided, because they are tailored for a very minute segment of the market. There simply is no big demand out there, from ordinary people, for hardcore self defense or WTF sparring training.