have scoured these forums to find ANYBODY who has had a W leave, not contact their LBS and then come back, I haven't seen a single example. I do take the great advice that sandi provides in her posts, BUT one thing that sticks out to me is that she had an underlying religious faith/relationship with God that I do not think my W has. I think that for WW who do turn around having that underlying faith is a very important aspect.
Like Acc said you are engaging in a LOT of "stinking thinking". You are spinning the worst possible scenarios and outcomes for everything. Such pessimistic thinking will prevent you from growing as a person and will surround you with a black cloud that NO ONE, especially your W, will want to be a part of. I've been here a lot longer than you and assure you I have seen many recons that came against all kinds of different "impossible" scenarios. A very good friend of mine went through the exact scenario you said is unrecoverable. His W suddenly left him and immediately moved in with an OM. They had a home and a business together. They liquidated everything and she went no contact for almost 2 years. Then she pinged him and they started talking again, then having lunch, then dinner and a movie, etc. etc. They moved back in together about 4 years ago and have been not just content, but REALLY happy ever since. Their sex life is through the roof despite them both being in their 60's. And neither of them is religious at all, so that was definitely not a factor. He doesn't know anything about DB'ing but he came about it naturally. He gave his W time and space and went about doing his own thing. Guess what he changed about himself? Nothing. He didn't do a bunch of 180's that drew his W back, he just left her alone and eventually she figured out she had made a huge mistake leaving him.
I'm sure now you'll say "but that's only one example" because, again, you're engaging in negative thinking. This isn't a game of numbers, you don't need a thousand examples to see recon is possible, only one. ANYTHING IS POSSIBLE.