As Colin says, a sign of the times. We are even seeing the first signs of contraction in that oldest bastion of the model world, railways, with a couple of the big vendors going under and even the Airfix/Hornby/Corgi/Scalextric empire now looking at restructuring.
The fact is as plain as it has been for many years now, kids, in general, are simply not interested in making things. There are exceptions of course, but there are very few and not enough to support the big vendors, shows and events.
I even see it in the classic vehicle market where my two old classic bikes, once considered sound investments, are now worth significantly less than I paid for them. That’s if I can even sell them.