For people with kids who'd otherwise be playing their own games (not an uncommon case, from what I've seen) this would actually increase human interactions, because these are collaborative games.
There are two types of games - those that kids can figure out on their own and those that need to be explained by their parents. Former get boring quickly (in a matter of minutes) and latter will interfere with the dining. Varies by a child of course, but the rule of thumb is to stick to the games kids are already familiar with if you want to keep them occupied.
(edit) But on a more general note - are these devices just to keep kids entertained? Might not be a bad idea, but it needs to be positioned as such.
