I would agree that once a divorce was finalized and the X has married someone else that IMHO, it is time to move on. That said, I do not believe that any of us are in a position to tell someone what and how they should choose to live their life.
It's a relationship message board. They come here asking for advice; we give it, based on what they tell us their situation is and what we think would be best for them. It's up to the person posting to either accept or reject the advice.