Exactly what difference will it make?

It should kindle an interest in reading books for a start. As far as grammar is concerned, it is easier to see punctuation marks and then get a gist of its use in context. Basic grammar that is.

Kids are reading less
I think the opposite. The internet is a great big magazine. It's what they're reading that's the problem. A lot of the younger ones are not to concerned with punctuation when it comes to social messaging.