Getting kids involved here in the US is a tough sell, but there is hope. I've got daughters and that's a really tough sell. The wife does not think it's appropriate for girls to be building "war machines" and finds history a bore. Unfortunately, that rubs off on the kids when they hear that from their mom. My solution is when I go to the Hobby shop is to let my youngest daughter pick out a little something to paint (usually ceramic horses or butterflies) while I'm working on my stuff. She may not be "modeling", but we get to have our time and hopefully she'll look back on it when she's older & think fondly of our hobby time together and encourage stuff like that with her kids.
On the hopefull front, With all the pre-built stuff on the market today I think that will lead a lot of people back to the build it from the ground up hobby. That's what got me back into it. Once I realized that there was only a limited amount of subjects being addressed in the pre-built market I turned back to modeling. Kind of a circular route, but one I'm sure a lot of people are taking these days. Once a person realizes the satisfaction of having cracked open a box and seeing the end result when they are finished they're hooked again. I know the pre-built gives instant gratification, but it's a very short lived satisfaction.
With kids & youth it's really a multi-dimensional approach. It's not enough to just give em a kit and say "build it". To really hook them they need something to draw them in. Have them read a good book or two about the history or even watch some good movies or whatnot. Once their imagination has been tweeked the rest follows naturally. If they don't have a clue what a Sherman, Tiger, or other tank is then their imagination will not be engaged. That too me is what's lacking the most from getting them interested. Kids are given such a dry and ,lets face it, boring impression of history in schools it's no wonder they would rather stick their hands in a blender than learn about it out of school. But show them just how interesting, facinating, and compelling it really is and you've got a fan for life.
And for us parents, it's about taking a bit of time away from our "serious" hobby to spend with our kids having fun showing them the "joy and rewards" of the hobby. then, once they're hooked, we can bombard them with the "seriousness" of the hobby. Imagine the 1st time junior is bombarded with that "Panzernachtschlepper only had 2531 rivets, not 2540 rivets" or "that's not the "correct" shade of Dunkelgelb for that minute of that day of that lunar cycle when that particular planetary conjunction happened"! Then the fun will really begin. Note: said with tongue firmly emplanted in cheek!
Enjoy and let's hope our kids will one day love it as much as we do. Cheers and happy building!