I seem to recall a discussion about this before. I looked it up and it turns out that this time last year people were commenting about Poplar Tree going Hispanic and everybody who lived in Poplar Tree was in denial...
http://www.fairfaxunderground.com/forum/read.php?2,6433,6841#msg-6841
Having been through Greenbriar and Poplar Tree in the past six months, it is obvious there is an illegal immigrant beach-head in the area.
However, I think it is stupid to pull your kids out of the school as it will only create room for more illegal immigrants to move in. I would keep my kids in and fight to have classes beyond ESL. Otherwise you will end up living in West Virginia and you'll still have the same problem eventually.