I wonder about this sometimes. Mine is a vanisher too. On holidays, he reaches out and sends messages, "I miss you guys, blah, blah, blah..."
The last time it happened, I shut it down, because it was too painful to deal with for all of us. He's been out of our lives, gradually removing himself completely, since Jan. 2012.
I sometimes wonder if I'd even recognize the changes if he actually was coming out of the fog.
"You know, it's times like these when I realize what a superhero I am." Tony Stark/Iron Man
“Focus on what you can do, then do it with all your heart.” Lois Wilson