Nurture vs nature, maybe..? Until they're sufficiently schooled to follow their own interests, children will only learn what they're taught.
I suppose the huge uptake of digital photography by the previous generation has left todays youngsters with no knowledge of film based photography, in both a practical and historical context , unless of course they're lucky enough to have a filmwaster around to share the knowledge.
Like McDuff, I have teenage kids who are more than comfortable handling their film SLRs, as well as digi compacts and phone cameras. I figured it was entirely normal, but now I realise, perhaps it's not... I'd not even considered, before seeing this video, that a high percentage of todays kids would have not the slightest inkling that photography existed pre the digital dawn.
Hopefully some of those who find an interest in photography through digital will be sufficiently enamoured to delve back into the history and that inevitably leads to film...