Not that Doc would leave Negan out there to die, but the man hasn't been doing himself any favours to gain Doc's favour.

"The people still around are more important. Especially Malcolm, and the young ladies. And if it's between me or anyone else, don't bother with me." He's meant to be dead for a hundred and thirty years now. It's fine if his time is finally up. He would not place his own life above anyone else's.

"People are meant to survive, Mister Caffrey. I have done a great many things I am not proud of, but I would do them all over again if I could ensure everyone gets off this sinking ship." He can't promise that they would be able to leave, or that they would still be in one piece and of sound mind if they do. All he can do is try to shoulder the burdens that he wouldn't wish upon anyone else.

"Let's just take things one day at a time."