That is the statement that seems to sum it up for the majority of Joe Public and is IMO holding back the younger generation.
Go on YouTube and just look at the diverse modelling of other forms, cars, trucks, aircraft, boats, busses, farming equipment, construction equipment, etc., etc. There are young and old of both sexes participating, but they are never perceived to be "playing". They are classed as skillfull people who model the real thing. Perhaps railway modelling also suffers because it is a very old hobby, it needs a fair amount of room, it is in the majority of cases in a static location and cannot be mixed easily with other peoples models, unlike the remote control gatherings of trucks and constuction equipment for example.