I think things can move in a positive direction before and after the move. My wife and I actually got along fairly well prior to the move. The issue is that emotions are so raw and everyone is so sensitive that any minor, or unintentional, transgression can upset the balance.
One thing I've noticed about myself is that I'm inconsistent in my treatment of my wife. When I'm not angry I'll talk and joke with my wife. When I am angry I'll talk and joke with my wife, but my humor is a little more biting and sarcastic. I've got to work on that. The point is that, if your wife does move out, expect to have some anger bubble-up inside, but don't let it bubble-over in your conversations with your wife.