Since so many parents think the Apple Store is a babysitting service, I'm glad they're cracking down on this. I hate it when I go in there to look at something I'm considering purchasing and kids are on there playing around on the computers.
Alas this happens in just about any suitable store. When I was an artist in a downtown art building, people would bring their children into my studio during open house, and leave them there while they went off and not tell me*. It got so that I would have to run after the parents and remind them that their child was in my studio! Lots of red faces but better that than a missing child.
I think it's hard to run a good Apple Store, you have to balance a nice atmosphere and super helpfulness with maintaining order and not letting people take advantage of you. Not easy.
BTW, my husband was 5 minutes late for his appointment with a genius (he is older than 18) and was told it was canceled. So he raised hell. He got great service. Common sense can be an elusive quality nowadays.
*I used to turn around a find a little kid standing there looking at me. "Mommy is just visiting other studios, she will be back." Wow. These people were perfect strangers to me, too.