Solid points for sure with the "if it's not broken, why fix it?" comment. If FCP7 is what a person is used to and they can still get everything done in a timely manner with it, then there's no need to upgrade.
In my eyes (a touch biased as I've always used premiere), adobe is making some serious power moves and allowing for a much faster workflow than currently available in FCP7. The ability to work with just about any file format in one timeline without having to spend the time to transcode is huge. With the addition of some of these new features you'll be able to take a project from start to finish without ever having to leave premiere.
I love how they finally added adjustment layers; that'll be a huge timesaver when it comes to grading a whole timeline. 3d motion tracking in AE is also huge as that's something you used to have to do with 3rd party programs.
I'll be making the upgrade very shortly for sure. They seem to impress me more and more with every new version.
The Main Idea