Long time no post.
I now teach "MMA" as in I teach Grappling (BJJ, Judo, Wrestling) and Striking (Boxing, MT, Karate non traditionally) and compete in MMA matches.
I also teach kids and for the most part at 7 its just another activity for them. It doesn't matter if it was MMA, Karate, or soccer. When they get into their teen years is when they will decide to take the training seriously or not.
I often warn parents that they shouldn't look to MA to instill discipline, respect, etc in their kids. That's their job. My kids are well behaved because I taught them to be not because of MA. (Besides they all have their own tastes. My oldest loves BJJ and Judo. My middle Karate, and my youngest wants to hit pple with swords)
There are no excuses on the mat, in the cage, or on the battlefeild! Train wisely!