I hope you gentlemen don't mind me butting in on your debate, but I may be able to provide a little common ground. If not, I'll butt out and mind my own business.
I was an active practitioner of Hapkido from 1977 until 1998 and though I cross trained in several systems, if you forced me to "claim a single style", I would probably have had to say Hapkido. I have also earned a master's rank in that system.
Since 1998, I have (what I believe) evolved into a MMA'ist, but I do not shun my TMA roots. There is much from my TMA training that I still use and teach. In fact, it could be argued that all of MMA is rooted in TMA's (if you use a broad definition of such and include the martial sports, many of which are older than the modern version of most TMA's), though the MMA mix is causing much more momentum in the evolution of the martial arts than in any previous era (IMO).
A common argument of the MMA enthusiast is that "if it don't rule in the cage, it don't work for real". Well, there are a lot of things in the TMA's that really were tested in real-life combat and passed the test. There are also many things that are commonly taught that work great on a cooperative partner, but not on a resisting opponent under adrenal stress. Many of the training methods, that are there for safety, do not give many TMA students a real feel for how to use practical application of much of what they learn. OTOH, many MMA trainees ignore (often with disdain) many of the static drills or cooperative drills that would allow them to broaden their skill sets and later take them live.
My main critique of the effectiveness of much of Hapkido is that too many of it's techniques rely on fine motor skills that are compromised under adrenal stress. Also, most practitioners do not train enough in a "live" fashion. My biggest compliment to Hapkido is that it is still mostly taught as a "complete" system (though almost all systems started this way and can still be taught and trained this way). There are some who refer to it as the "original MMA". Also, as primarily a combat system, it does include strategies and techniques that go beyond the use of force that a sport-based approach would deem appropriate for their intent.
For my own MMA mix, I have been able to cross train at a high enough levels in diffrent systems to make what I learned (and taught) in Hapkido almost obsolete. The striking of MT, boxing and TKD. The ground work of BJJ, Submssion Grappling, and NHB (including ground striking). The joint locks and pressure point work of Small Circle JJ and Ryukyu Kempo Jitsu and the weapons work of the FMA's. Extensive study of each, integrated into a MMA whole has been, for me, a further step in my evolution as a martial artist on a path that my Hapkido training helped to begin.