If the school district was truly concerned about the kids learning a second language, there would be much more time and effort devoted to it.
+1 If something can't be done right, don't do it at all.
And as for "exposure", there is plenty of "exposure" going on given the number of "other language" students in FCPS. The students mix with students from all over the world constantly. Other languages are being spoken constantly and a half hour of FLES is going to do little compared to the kind of exposure they get from their classmates.