The objective characters do not “change” although they may (and often do) adopt the OS Solution. Though it can be hard to see, this is not a change of perspective but a change of problem solving methodology.
At the OS Domain level, in Mind (Fixed Attitude) stories, you have a problematic mindset that is causing difficulties. By the end of the story that mindset-based conflict will be resolved, either by showing it’s no longer causing problems, or by showing that the efforts to resolve the problems were unsuccessful and aren’t going to be solved in this story. (The latter case might be called “left unresolved”.)
Now, how that resolution occurs is up to the story, so some OS Mind stories might show that mindset is no longer present (e.g. people stop being racist). In other cases maybe it’s still there but just no longer causing problems (e.g. people learn to consciously override their prejudices).
If “everyone desires lifelong love” is part of the mindset, and everyone gets happily married, does that mean the mindset is gone? Or still there, just not causing problems because it’s fulfilled? I don’t think it really matters.
