User blog comment:Argorrath/Black Ops III - Menendez will not be returning/@comment-24001421-20150625010106/@comment-4872910-20150625100922

And also, he might even be dead by the time of BO3. If we take him for his oldest age at the end of BO2 (63) and then go from there, he'd be 106-108 years old. So unless he's one of those humans who are lucky enough to live for over a century, I doubt he'd even be alive by then.