I was discussing productivity specifically once their smart phone is "pulled through into industry with them". From what I have experienced, ancient computers are still more productive than smart phones due to their openness and ability to get things done / developed on them. This same thing happened with macs ~2007 (before then, they were very rare!) but wasn't quite as damaging because they are still workable as fairly capable workstations. Phones are not (terrible keyboards for one).For kids, 'productivity' is not the point, 'aptitude' is. 'productivity' is what the boss can get out of you. 'aptitude' is a measure of potential that gets realized (and paid for) by the boss later.
But whilst you are bringing up aptitude, this is relevant too. I strongly feel that someone brought up in a "click and play" environment like a phone appstore vs being exposed to the problem solving required for i.e DOS, computers back in the day will be at a disadvantage. I *think* this is starting to show from some of the recent candidates I have interviewed. But it could also be too early to tell.