As I said eariler, I cleary interpreted your "finality" to be more "final" than you intended. I think "binding", rather than "final", might be a more appropriate term. Your successful use of Diplomacy (whatever mechanics we adopt for same, be they the present one skill roll &D model, or some more granular social combat system) does not make the target your loyal friend for life, come what may, but it does mean the immediate objective of your diplomacy attempt is successful, and not either vetoed as "out of character" or eliminated before the benefits are realized (ie the guard does not have second thoughts and raise the alarm as you enter the camp) by a change of heart that effectively renders the initial success irrelevant.
Yea, I think [MENTION=42582]pemerton[/MENTION] was referencing the finality of the scene rather than finality of a longer period of time such as a day, week, or forever. It's funny how we all have different language and forget that others may not be thinking about events using that language, especially those of us who never went on with 4e and don't think of the game in scenes and encounters, even though we may use the idea instead of the language. It takes a bit getting used to, at least for me. I almost wish there was an easy guide someplace, like I have to use as a reference for text speak

Binding is a better term and more accurate I believe.