SORRY MODERATOR - 2 posts in a row. Don't tase me, bro, but I just thought a' this:
I built a battleship model with my kid: many days, due to paint drying etc. Is ANYTHING more illustrative of the difference in attention spans than the demise of model building? ALL the kids I knew built some kinda model in the 70s/80s. I can't imagine modern teens doing such a non-immediate thing. Ok, be well, all! Trek on, Garth. Sorry, LORRD Garth!
I was hugely into model making as a kid (born '85 here), I was making models all through the 90's (still am today, although less so due to other more boring commitments).
Plenty of people my age made models and still continue to do so (even if it's more Warhammer oriented).
So I dunno - it was a popular hobby in the 90's at least.
Also Warhammer is pretty popular with kids even today, so whilst maybe model-making is a less 'mainstream' hobby for kids than it used to be, it's still as popular as ever.
Just my two cents re: kids today aren't so bad.