I think there may be some tendency among both medical providers and patients to shy away from activity because of the pervasive hypophobia in the medical system..."don't try to get < 6.0, you'll have hypos..." "be careful driving, you could have hypos although, of course, we won't cover enough test strips to test all the time..." "be careful with activity, you might have hypos".
For me, activity is a huge motivation to not screw up my BG or to beat it into line so I can squeeze stuff in. To me a study showing that control is improved with activity should lead to the more logical and useful question of "how can people with diabetes be more active more effectively?" which, unfortunately would lead to an increased need for test strips. If a heart attack costs say $25-30K, quite a bit more if you need a bypass or stints or something like that, it would seem to me like it might pay for quite a few test strips? I understand that crazy activity is not for everyone but I don't see the study, despite it's "obviousness", as being totally ridiculous.
Re school aged kids, we hide the remotes or take them with us and lock all the computers.