I thought when I started to push the D along that my W might be shocked into an awakened state but that didn't happen. I initially thought that her moving out would possibly give her an opportunity to see that keeping the family whole is the right thing to do. I now think that I am kidding myself.
They don't wake up because they're too engrossed in their own self-serving and self-gratification selfishness to acknowledge or recognize what any of this is doing to the kids or their families. Plus if they did, they would have to start dealing with the guilt and consequences of what they've done. The easier road for them is to continue living in the denial and fantasy world that they've created for themselves.
Sorry, don't mean to be so cynical, but in most cases I really think the above is true.