Yeah, and I do Muy Thai, Sub wrestling and Judo. How about I learn fencing to complement my MMA ?
No on a serious note, I think it would be a bad idea.
The time you devote on TKD could be much better used by training more of what you already do, given that your goal is MMA.
Plus you'll get bad habits : kicking with the tip of the feet, not protecting, etc.
TKD is a beautiful art, but not appropriate for MMA.
Actually, I'd
would (and do) take TKD (not fencing, but why not?
) to complement a MMA regimen. While mixing art forms at any level will make one's technique less than optimal for any one specific art (due to differences in rulesets and conflicting muscle memorization), the foot-work used in TKD (let alone fencing) is so quick and fluent, I'd appreciate a level of grace and precision in my movements. I already hit hard enough. Accuracy and speed are the focus.
Not to say you won't develop this in other arts but realistically, different arts focus on different things. For example, A BJJ-er
can have D1 wrestling caliber takedowns. But looking at the overall focus of the art, this isn't likely to happen often.
Once again, it comes down to what works for you, what you need to work on, and what you can make work.
**tangent**
Of course there's the tried and true MT, BJJ, Wrestling, Boxing mix. Looking at the history of MMA and the development of the UFC in particular, every time somebody brought something new to the table, it started an "era" if you will. Wrestlers, then BJJ, then Strikers (Boxing/Kickboxing), etc. Now it's (very arguably), "TMA" Karate, San Shou, etc (with questionable examples such as GSP, Cung Le, and Machida.) GSP is a poor example because his wrestling and overall athletic ability is usually head and shoulder above others. Cung Le...yeah. Machida is a great example though.
Point is, why not learn something different? I guess if you're looking to make a buck off of MMA, sure go with what works. If you're more willing to take a risk and possibly get a big advantage, try something different.
This sentiment (MMA = Boxing, BJJ, MT, Wrestling) makes me wonder how long MMA can be considered an amalgamation of fighting styles and not just a new style in of itself. Plenty of other "styles" focus on all ranges of fighting. I see in 50 years, MMA being recognized as a TMA.
**end tangent**