Will only get worse as racing becomes more centralized, it's the rural kids that go to their local race meeting that see it and want to be involved in the game. Whether that be jockey,stablehand or even just a future owner.
City races you don't see kids there, mum and dad might be there having a day out on the booze at the cup meeting but the kids are at home not getting exposed to the sport unfortunately.
It's the hotdog and leaning over the birdcage rail and patting the clerk of the course horse that kids start to think this going to the races is a pretty cool thing to do.
Sitting at Grandads watching horses running on TV I'd imagine is pretty boring to 99% of kids and very unlikely want them to get in to the game.
That's my experience anyway, from me going to the races as a kid with causal followers as parents and I got hooked and now train a few slow horses. To watching my kids friends who would come around and show no interest in the races on TV, but a few times the ones who come along with me to the races loved it and now one friend of the daughter is riding a bit of work.