I'm not a parent, but I think that sports can be a good thing, and especially team sports.
Team sports as a medium teaches cooperation among peers. It's always good to realize that it's not just us that matter, but "all of us."
Exorcise is always a plus!
I don't think that sports are necessary at all though - clearly some children are not going to be interested in sports, and neither should they be.
It takes a whole village, or so they say...