Moffat.Moffet
I didn't dispute this at all.made a comment that The War Doctor had been around a long time (To see evidence of this, you can see in the reflection, that McGann regenerated into a young looking John hurt, and he regenerated into Eccelston as an older [current day] John Hurt)
See, I didn't get the impression that he was dying. In fact, the more I think about it, the more I realize that in the end, he realized his role (not being the Doctor) was over, and it was time to return being the Doctor. "Wearing a bit thin" is a self-referential line, winking at his first-ever incarnation. So in essence, he filled out his role as set by himself in his eighth incarnation, and his ninth incarnation would now have to fullfill the role of being the Doctor again.I definitely got the impression that The War Doctor had worn out his body. Sure, he could've probably pushed it further, if the war hadn't been over, but, he definitely said it was time for him to rest when he regenerated.