It probably doesn't apply to everyone, but for me....it was all about freedom. There was nothing in my house that I cared to take with me and I didn't care what crummy place I lived as long as I could get away from H. Crazy, huh? The things that had always meant so much to me suddenly had no value b/c I was a different person.
I guess we can't always say what would work for another person. I think "if" I had ever left my house that my pride would have been very tough to overcome enough to go back. Besides, my H said there would be "no going back home" if I left. Anyway, I didn't leave......and we are still together and OM has loooooong since left the life of this W.
I believe there are some cases that it would be best if the WS was told to leave. It puts everything into perspective real fast. OTOH, I would not advise it unless the LBS knew they could stick to it. Doesn't make a good bluff. (Not that that's what you're suggesting.)
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!