Just saw this article on CNN: http://www.cnn.com/2013/02/04/travel/kid-free-airplane-zones/index.html?hpt=hp_t3

Child free zones in coach on an Asian airline. You pay extra for the seats they way you do for the extra leg room seats, and they are separated by the toilets from the regular rows.

I think it's a good idea. Flying without a kid, I'd prefer to be farther from them, but honestly probably wouldn't pay up. I imagine when I am flying with a baby, I'd rather the people that really, really don't want to be around a baby be far away from me so I can avoid the dirty looks. What do you think?