To be fair 1958, the better kids ie:the ones who's parents can afford to have them in Rep/All-star are practicing in the 2-3 range usually BUT they are also running 4 full lines and 3 set of D in games.
Either way though, I think you're absolutely right in the overall argument.
There prolly are more kids playing actual organized hockey today but there are also less kids in general playing.
Going back 30 years when I was 10, every kid I knew that played House league and Rep/All-star would also spend hours upon hours at park rinks inbetween and there were plenty of kids that were very good on those local outdoor rinks that didn't play any organised hockey at all. And in the summer when there was no real organised ice hockey, a lot of kids played organised ball hockey and everyone played street hockey.
I don't even remember the last time I saw kids playing hockey in the streets or in parking lots
Then when Highschool came along, half of the players would come from the kids that couldn't afford to and never even played organised hockey before. Their vast hours on the local outdoor rinks had honed their skating, stickhandling and especially their creatively very well indeed. Sure, they all needed to be taught better defense and systems but you sure as hell didn't have to teach them what to do with the puck, handle the puck or how to go to the net heh.
How often does that happen anymore either?
How many kids aren't getting into the system anymore because of money and especially lack of other options?
I know for a fact I wouldn't of made Junior B without those thousands of hours at the park rinks in the winters and the streets and parking lots in the summers. All that AND playing 2 games and 2-3 practices a week in organised hockey from age 8 till 15.