I have studied a number of martial arts (Brazilian Jiu-Jitsu, Shorin-Ryu Kempo, American Kenpo, Muai Thai, Shaolin 5 Animals Kung-Fu, Wing Chun, Sambo) and I noticed the 95% of the martial arts out there don't evolve with what's going on know. The Senseis just re-teach what they were taught. On the other hand there are arts like Brazilian Jiu-Jitsu, and American Kenpo that are always refining the techniques so they are more effective in the fights of today and not sticking with what worked 300 years ago in the fights of yesterday.
Many martial arts are only effective you are a certain size or body type. I'm a short dude, so kicking a guy in the head is pretty hard for me.In Brazilian Jiu-Jitsu, it's not about size or strength, it's about leverage, speed, and timing. I have ended a few street fights against someone larger than me without throwing a punch. There is quite a bit of difference in Jiu-Jitsus. Japanese Jiu-Jitsu focuses more on getting a guy to the ground like Judo, whereas Brailian Jiu-Jitsu focuses on the ground game.
As far a Jiu-Jitsu being Aerobic. It's quite Anerobic actually. You do have to find a "qualified instructor" to be able to learn how to properly apply any martial art to a street situation.
Anyway...... Back on topic. I don't understand why Wrestling and America has been brought up. The greatest Greco-Roman wrestler ever is Russian (Alexander Karelin) and alot of the Middle-Eastern countries have really good wrestlers. I believe alot of the smaller american cities embrace wrestling because it's a cheaper sport for their kid to play than football or baseball. You only need 3 people (one is the ref) to have a sanctioned wrestling match that people canc ome and watch whereas you need more people to play a sanctioned game of soccer, football, or baseball.