How to get more kids to fly? Take them flying in the first place. Let them know it's possible and that they can do it. Point them towards the PFA Young Eagles scheme. Learning to fly Power is fairly impractical unless said kid is exceedingly well off but gliding is relatively cheap. Many Gliding clubs operate a Cadet Scheme which reduces costs even furthur and the added advantage is that learning to glide at a member run club, where all the work is done by the members themselves will either teach the kid to pull his weight and be rewarded with 'respect' or confirm that he is not worth bothering about anyway. There is so much to be learned in such an environment and responsibility will be passed to the person who is able , not the biggest or the oldest.
I could go on but I'm sure you know what I am getting at.
Mike W