Looks like google predicts the end of model trains

[Brakie]

Certainly the hobby is changing. The trend is towards larger scales and mega-layouts, well beyond the means of a lot of adult modelers, let alone young people. It's also a largely sedentary hobby that mostly takes place indoors, which is not usually attractive to young, active people.
------------------------------------------------
I'm not sure if Godzilla size layouts is still the current trend unless its a Model Railroader article.

I think the trend for the average joe modeler is building smaller highly detailed layouts..

I've also noted the increase interest in ISLs..Lance Mindheim has 4 books covering switching layouts and You Tube add dozens of videos on switching layouts.