Believe it or not, the very kids who loved train sets are the ones who ended up killing the hobby. They grew up, got money, and companies started making the expensive dream sets they could now afford, increasingly catering to adult collectors instead of the next generation. When parents compare expensive, adult-oriented train sets with affordable toys like LEGO, it's hardly surprising which they buy for their kids.

And that's the crucial point, it's not necessarily that companies are focusing on adults because kids have lost interest. Kids may be losing interest because companies have focused on adults. LEGO could fall into the same trap.