While it would be nice to see the finale storyline work towards some form of fan service, it’s not like there will be any major impact on the story unless CBS is considering springing a spinoff on us with one of these characters at some point.
While it would be surprising to hear that two team members will be heading off for new jobs in the finale (especially since we were promised that no big changes would happen at the end), technically, JJ and Prentiss would still be fighting crime, just in new ways.