You come across as angry and bitter, not that I blame you. I obviously don't know all of the details of your sitch, but it seems to me like you haven't yet reached the root of the problem in your marriage.
Your W strikes me as a MLC. Maybe she needs fulfillment she's not currently getting (I'm not saying its about you), and this is what makes her have these thoughts. I take it she's a SAHM? Does she have friends/hobbies/activities outside of her SAHM life? I think that's a common problem with SAHMs (and I am one). Maybe getting a job, or a new hobby, etc. is what she needs- not a divorce.
I think when some people are missing 'something' in their life, the marriage is the first thing they tend to blame.
