I don't see Meri and Kody ever really being together again as a couple. As he said in the therapy session, "We're family, but we're not a couple." I think if she chooses to stay, that's the way it's going to be. She'll either need to be OK with that, or make the decision to leave. I do think that she stays because she's so attached to the family. She obviously loves the kids and enjoys being part of the gatherings and having a sense of community. I think she would like to have a relationship with Kody again, but I don't think he wants to give it the effort. And really why should he? He has 3 others wives. If a relationship with 1 goes bad, he'll just concentrate on the others. It's actually very sad.
The reason I don't see them reconnecting is that they are so different in how they approach things. Whenever there's a serious family discussion, Meri's strategy is to lurk in the background and not say a word. Each time they discussed the big house idea, she said nothing. She waited for the other wives to speak up so she could gauge their opinions first. She would continue to stay quiet, then act like a victim when something didn't go her way. It's a very passive-aggressive approach to life. Kody is out there and in everyone's face with his opinions, sometimes to the point of being a bully. When you put the two of them together, it's a recipe for disaster. I just don't think either can deal with the other's personality anymore, and neither is really going to change.