I doubt it. Like I said in an earlier post, there is a certain temperature level that has a paralizing affect on snook. If the temp stays at that level or below for more than a few hours, the snook will die. Just a little ways north of Tampa Bay, it will get cold enough some winters where you will see some winter kills.
Unless we get some serious global warming, I doubt the Ga waters will stay warm enough in the winter to support more than just a handful of wayward fish that wandered too far north.
I know this is a 2008 thread, but I was casting for bait in a estuary mud hole off of Harris Neck Road two days last week, and caught over 10 baby snook each day. At two to 4 inches they must be breeding in this area. I was surprised.