I am in the same boat as you on this issue. I must go dark as much as my situation will allow for my own sake. This whole mess would be infinitely easier if young children were not involved. I would probably just wash my hands of the W and be done with it. I say that knowing that it would take a true miracle to salvage the R at this point.
Like you going dark will have zero impact on my W and that is okay for me. It will, however, hopefully allow me the necessary time to distill off as much of my anger as is possible so that I might be able to engage my X comfortably in the future. God knows I am nowhere near that now and might not be for possibly years. The sooner I get there the better though.
My guess is my anger and disgust for my W will likely increase as D day gets closer and than it will hopefully begin to decline gradually once it is final.
M48/W47 M15/T22 S3 D3 In House Separation 10/06/09 W files for D 10/16/09 OM1 discovered 10/28/09 (PA) OM2 in mix early Jan. W moved out 1/26/10 In Mediation (Settlement in prep)