Tom you are right. The school calendar is a holdover from years ago when students were needed to help with the work on farms;the hayfield,the gardens etc.. Now you are lucky to find a kid who will mow their yard! The teachers and administration all plan their vacations for the summer, so you won't likely see the calendar change.
in ohio the west carrollton city schools have a schedule sort of like college quarters. they call it year round school. the kids sort of like it because they get a longish break in every season.