JRuss, I am far from an expert on DBing and I am fighting my own battles trying to keep on going.
Just from your last post about over hearing your wife it really sounds like she has fully given up and is just treading water until she finds out which way she wants to go. Personally if it was me and I don't know I would have the guts to do this but I think you need to get ahead of the carnage and discuss it.
I look at it from the point of view of what is to gain what is to lose. At this point you have heard her say there is no hope and she doesn't want you to have false hope. I guess the question is are you happy to sit around in limbo land knowing what you know and that she could walk out at any point or put the pressure on her to make a decision.
There is massive risk in doing that but to me I ended up where I am being a doormat. I feel it's the same old story people want what they can't have and right now she can have whatever she wants from you if you take that away it might give her something to think about.
As always a motto I follow "Listen to advice but never follow the advice of someone that doesn't have to live with the results"
Good luck
ME- 31 W-25 T-5 M-3 D2 ILYBNILWY and moved out - FEB16 W seeing someone else - JUL16