Khafra,
Ending a fight with one hit? You can do that with simple boxing too. I wouldn't trust my life with anything that resembled tai chi on the streets. If you feel good about using that stuff against aggressive non-cooperative opponents then you my friend have fallen prey to HYPE.
This is how I see it elite brethren...
There is so much unessential crap out there in the martial arts. All kinds of tradition, people you're supposed to bow to, and other garbage. There are very few instructors out there that are worthy of such submission. The ones who are worthy I respect the hell out of, but many are just jokes. Because of this I picked an art that allows me to be the person I am, not some fuedal japanese or korean shoe shine lad. With traditional martial arts you waste incredible amounts of time with tedious things such as history, language, formality and friggin katas and pumses which resemble dance moves more than they do combat. For the bro who started this thread... Do you wanna dance, bow to Tae Kwon Do instructors with names like Joe and Bill, and learn how to count to ten in korean? Or would you like to learn how to really fight? Tradition bogs down the essence of what it is you are trying to accomplish. If you want to fight and know how to truly defend yourself forget tradition and find a BJJ, Shootfighting, or Pancrase school that is in the business of doing one thing and one thing only...TEACHING YOU HOW TO BEAT ASS!
It is schools like these where you will want to respect all who attend because you know that on your first day everyone there can drop you in a heartbeat. NHB fighters and practicioners dont think their techniques work, they know their techniques work. Life isn't a point sparring match bro. Practice as hard as you fight!!! Find a school and an art that will allow you to do just that.