I must say that in relation to "real" street fighting and how well CMA works against opponents of your size or larger...the real answer is who knows. There is nothing that can prepare you for that first fight that changes your life, the one fight that you will be scared ****less, the first fight is going to be your worst fight as most of us only train for the situation but are never ready to experience. I can discuss theory and effective/ineffective physics/dynamics of certain styles/MMA/Kung Fu or what ever...but I am not going to.
The simple answer that others have concluded, is will you get the hit/strike/grapple nescessary to prevent a person from taking your life. I don't know, I continue to train to never encounter another situation like that as one really learns martial arts and fight to really not fight because it is a scary and brutal thing: the real fight when you feel your life in jeopardy, I would do all I can to kill/cripple/maim the attack as fast as I can (and most arts teach this more or less). There is a big factor that any art cannot really prepare a person for which is luck. The luck of the situation, what if you got unlucky and didn't get your strike in or if there was another person that comes behind you, a gun involved, or knife pulled out suddenly. As luck can work against you, it can work in your favor and the training you have done prompted you to connect your strikes/techniques to defend and attack your aggressor. It all matters on luck and the first hit in my opinion. I train in a Kung Fu/Muay Thai hybrid and make sure to cover the basics everyday, as I believe the basics of most arts are the same: thats what saves you in real life basics...the thing teachers made you practice until you can do them in your sleep.
"Don't Focus on the Fingers or You will miss all the Heavenly Glory!"
Morbicid-"Maybe some moves are made just so that, if u somehow manage to pull them off in a fight, u get some serious bragging rights.
Many famous fighters have done this (roy jones jr, chuck norris, Morbicid, etc)"