Hope... There are quite a few of us on this board living with fence sitters!
Sorry to hear your W says she is going to file. My first thought was, why is she waiting? I know the holidays are a big thing, especially with kids but perhaps she is still on that fence.
Although I call my H a fence sitter, he seems to be leaning in my direction a bit. But I'm not counting on that yet. I continue to DB and GAL where I can. Although I don't GAL too much as before the A bomb, we were pretty independent anyway. But we do spend quite a bit of time together now. I think that works best in my sitch. And I'm enjoying it. I was quite a lonely person before.
I try to be the person he wants to be with. Every time she drinks and gets nasty, that's one in my favor. The longer it goes on, the more my H seems to lean toward me. I hope you're right that he will get tired of it. She can be quite the b*itch when she's drinking and I know he won't want to live with that! He grew up with a mother who was, and still is, like that. I'm sure he's thinking about that.
However, if he's still in that fog, he may not see the situation for what it is. And when OW is not in her cups, she pursues as much as she can. Only time will tell and right now I have that on my side.