This is really how the Earth-2 Batman should have gone out back in the 1970s instead of by some no-name villain. It would have made him stand apart more from his Silver Age Earth-1 counterpart.
Have to admit though I am NOT one of those who enjoys the Bruce will die "all alone" or that he will "push away everyone" in the end idea. It was the main problem I had with the Old Man Bruce in Batman Beyond. Somehow Bruce at his worst (think Murderer/Fugitive when he rejected "Bruce Wayne" altogether or JLA: Tower of Babel or the whole Brother Eye thing) has not been able to shake off those who somehow love him. Even with all her dunkings in the Lazarus Pit, Talia will never let go of her "Beloved", Selina has her own baggage so she knows the score and keeps coming back for more, Alfred will stay until he dies, Clark has been willing to forgive Bruce anything (even the "The last time you inspired someone was when you were dead" line) and Diana - who was most adamant that she couldn't trust him or work with him when she voted him out of the JLA - was with him at the end of 52 at Nanda Parbet (or whatever its called) and had him arrange her new identity and job. Sasha's forgiven him for basically ruining her life and being ultimately responsible for turning her into a cyborg or whatever. Hal's still his friend (Cry for Justice OOC stuff nothwithstanding) even after all the garbage Bruce has thrown his way, Zatanna's in love with the guy even despite the fact she mind-wiped him, heck even Plastic Man's forgiven him for what happened in the Babel storyline. And I don't see any way Tim or Dick (or J'onn Jonzz when he comes back) ever really abandon him. They accept the way he is. So this whole Bruce gets old and dies alone thing never seemed plausible to me. If people were going to ditch him for his abuse and paranoia, they would have already.