Executive lounges are often mistaken as a play ground where children can be left on their own. So are hotel lobbies, supermarkets and so on. Yes, a playing child is something natural and, yes, children get easily bored when being left in an inadequate surrounding. So, behind each (misbehaving) child there is a parent who is in charge for the child's education. If parents don't care, the child certainly won't care either.
If hotels feel forced to welcome families with children they should not neglect other guests' needs. Why not establishing a play-ground-lounge? I read that the former Hilton in Paris had something like this. And then: access to the Executive for adults only. This would relieve the problem of overcrowding, but not of misbehaving adults.