"It's too bad she won't live, but then again who does?&
1. Deckard is a rep. He is not 'alive'. So 'Who does?' refers to Deckard.
2. Who really lives a fulfilling life in this horrible dystopian world anyway?
3. We're all going to die some time, so who cares if she dies?
4. What does it man to 'live'? Is it any different for the reps than humans? So 'who does' can be taken literally.
Please post back with comments.