Personally I never minded if kids played two sports at once. When my first son got to high school, I remember thinking how unfortunate it was that kids had to give up on one or the other.
With all of this chatter here about football teams having to forfeit for a player participating in too many quarters of JV and Varsity in a week, it seemed a little odd that you are allowed for example two or three varsity soccer matches plus a full quarter of JV football at running back plus four quarters of kicking for the varsity (and even playing both ways for that matter).