The problem with that question is it supposes two things (one clearly, the other by inference). Firstly, it supposes that TMA practitioners would change if they weren’t closed-minded. Many of us choose to remain with arts because of the challenge inherent in some of the esoteric practices.And is very effective!!!
Question is whether TMA is open enough to learn to improve now that they know and known for 30 years. I like to see them get into the Octagon and win some fights. I am Chinese, I would LOVE to see CMA beating people in the octagon. I will be cheering them on. I am just waiting.
Secondly, it seems to suppose the only worthwhile pursuit is one that can produce elite competitors. Many folks only want to to develop some fighting skill, and aren’t prioritizing their effectiveness over other trained people, at least not at a competitive level.
So we can learn lessons from the development of BJJ and MMA, but can also choose not to alter our traditional style as much as you seem to think we should.