It's a tough call, Khudoo, and one of the few tactics I don't really have a strong opinion on one way or another. If you decide to "stand for your marriage," and delay the filing of the separation agreement, then it could be seen as "hanging on," and not fit with the whole "Letting them go" thing that I do believe works very well. On the other hand, if you push for it, it goes against what's widely considered a DB staple, and that is the whole "If this is what you want, fine, I won't stop you, but I'm not going to help you move it (D) along, either."
Wrap into all of that the fact that filing for divorce is THE ultimate "jolt" that you can use to possibly jar the wayward out of their fog, and move back toward the marriage. It puts them in crisis.
It's a really, really tough call, Khudoo, and only you can make it.
