I have definitely thought about this before... Couver was a rehome, and there were people coming to see him if I didn't choose to take him home. When I got there, the lady met me at the door and I knew from the moment I saw him, that he was going home with me. He was very nervous and did not want to leave his owner's side. He was already attached to her, and I really hoped that he would love me as much. He definitely got attached fast, and I could not imagine him living with anyone else! He has his neurotic tendencies; the ball, the way he kicks his back legs when he gets excited and the little moans that he makes when he wants something. I feel like I am connected with him in a way that I have never connected with anyone before. I honestly could not imagine my life without Couver. We are completely in sync with each other
Khloe lived with her mom until she was 5 months old and is pretty wild, but doesn't quite have the weird tendencies that Couver has. I don't think she would have that hard of a time adjusting, and would be a good dog for pretty much anyone.
I know that I won't ever have to worry about this because my dogs would not be rehomed unless I died, and I made DH promise that he would keep them if I did happen to die.