We cannot predict the future, and I shouldn't even tell you this, really, but I just have this feeling if your W comes out of what she is doing and seriously does the work to make herself whole, odds are pretty good you will find yourself in a new healthy relationship. While your work has certainly paid off for yourself, and for your son, relationship-wise, it is really going to pay off for you. Maybe not in a R with your W, but in an R with a wonderful healthy woman. Maybe not something your are into thinking about now, because you are still building your life and dealing with the current sitch (wonderfully, might I add) but it's another perspective. The portion of work done for the meaning of healthy relationships will not go wasted. Maybe this is your path.
I think you are quite a catch, and I have never met you. I can only hope to meet a great father with such dedication to his family. And I know there are many woman who would appreciate that and nurture it the way it deserves to be.