Are you sure it's not just that kids have a wider choice of where to play? I've got two kids in that age group and they hog the console so I can barely get on it. Most of their friends have consoles too, probably mostly because their parents had consoles and they're in the house and accessible. And Minecraft, that's another big reason.
Not sure where you're getting this vision of a generation of touch babies who've never held a controller. That would be like no kid I've ever known. They know their way around a controller from an early age and better than many adults. I see it almost the other way, a generation of adults engrossed in their tablets and phones.
Is the big growth area on tablets/phones games for kids or games for adults? Consoles and handhelds are still a much safer environment for kids than tablets and phones, especially in a world of micro transactions. Not only that, as a few friends have found, tablets and phones are very breakable when in the hands of kids.
Mostly from demographic data. I'm sure there are exceptions.