Aside from all the other alternatives now available to kids and adults, trains are no longer important. Do kids play with any TOYS today? Please name a few. I have 10 grand children, and I think they have been mostly wedded to their "screens".
Over the years on this forum, I've gotten the impression that some of you "worry" about getting new blood into the hobby so that new goodies will continue to be produced for you...or so someone will be there to purchase your stuff.
One of my grandsons was my "train buddy" from 6 months old to 7 years old. We played with trains, watched train videos, and took MANY trips to Strasburg (often over-nighters). But at around age 7, he no longer showed any interest (including "visiting" my layout). Frankly, this does not bother me at all, since this is just one of MY many hobbies.