I don't want to sound like I'm talking out of both sides of my mouth, but I wouldn't do well in a sitch with an OP either. I remember once when I was dating a guy, and his old GF came up and tried to coax him away from me. And he was listening. I just walked off. I knew I would never fight for a guy that wanted someone else. At least if I knew I had given my best to the R. What would be the point?
But in a case where the WAS walked because the LBS failed the M, then I think some work HAS to be done to win them back, regardless of an OP or not. Especially if the LBS actually wants them back. Otherwise, going dark is just giving the OP free reign at your WAS. The OP doesn't even have to work hard, because the LBS has already done the hard part for them. All they have to be is breathing and they look better than dark (dead.)