Fucking assholes.
Yes, I recognize this doesn't contribute much, but I find the thought behind this utterly despicable and want to shoot the people responsible for this idea coming into practice.
EDIT: Productive time:
As a number of the article comments brought up, this totally ignores the fact that a fairly large number of children (myself included) are introverted and do not enjoy strong interaction with larger groups of people at once. Intervening with their lives and manually trying to push them into a mold that would work well for an extrovert is, ironically, going to result in little more than feelings of isolation and rejection, as they will not enjoy time in group activities and will probably wind up being outcast from the group but stuck inside it because they're not allowed to leave. This is setting the introverts up for disaster, and probably isn't benefiting the extroverts much either, as closer friendships are an important part of development and the introverts are generally going to be more prone to establishing and maintaining such relationships with extroverts than the extroverts will with each other - simply because the extroverts don't have much reason to do so.
I'm obviously playing up the model here, and probably making faulty conjectures, but I'm confident that my central point - that this interference is inherently bad for everyone involved - is solid.
Thoughts that came up reading:
"Yes, of course...under no circumstances must a child ever be allowed to discover what loss feels like."
And, with regards to the Chris commenter (page 1):
The girls are FUCKING EIGHT YEARS OLD. Of course they're clingy, possessive, and generally unpleasant - they're eight years old and growing up in America. I can't fault you for intervening and trying to even stuff out - that's the correct parental response to such a situation, honestly - but there's a difference between healthy parental intervention to demonstrate what constitutes acceptable behavior, and heavy-handed intrusion to prevent the close relationships from ever actually forming. The girls you describe aren't forming close relationships in the first place - they're just fucking around with each other because they're EIGHT. YEARS. OLD.
etc.