So...
It does look like the divested markets that Verizon dumped will be going AT&T eventually. Since AT&T uses GSM technology, I think you're going to be stuck UNLESS they keep the CDMA towers going for a while longer, perhaps as long as two years (just an opinion on my part, you understand), when you would ordinarily upgrade your phone anyhow, and IF you want to stay with AT&T at that point, you would probably have to take one of their phones and plans.
Not very fair, is it?