But there's still some tells like "soda" vs "pop" and you can pry "y'all" out of my cold dead hands. My wife and I had been living in Atlanta a couple years when I was speaking over the phone to a coworker in Syracuse, NY. Toward the end of the call she told me I had a lovely southern accent. Hung up the phone, called my wife, "Honey, it's time to move." :-)
Fun fact: I'm told that in Dallas, TX "y'all" is singular, the plural of which is "all y'all."