I don't think the ATL area is overdue as ATL just had a moderate ice storm last January when Greensboro got that big snow. Also, 2/2014 sure was a very bad one that hit south and east metro ATL hard including Tony and lead to the Eisenhower tree at Augusta National being taken down. Major ZRs occur in the ATL area about once every 4 years on average.
That being said, I count as many as 8 winters that had BOTH major ZR and major SN/IP in ATL since 1879 if I were to include the 2/2014 as an all in one storm as it had both major ZR and major SN/IP in south metro. So, odds may not be as low as one might think as these winters have occurred about once every 17 there. Before, 2014, the last ones were in 1978-1979,1961-2, and 1959-60.