If you mention the 5D II you should also mention it's stone-age AF. So, it really depends on the use - if someone is a studio/ portrait focused photographer, the 5D II is clearly the better choice. If someone is a sports/animal/kids photographer he will be much happier with the 7D. To me these are two cameras, which are not targeting the same kind of people and FF doesn't just make all pictures better.
I guess that you have never owned a 5DII or a ff for that matter. I have yet to find a ff that doesn't give a better image than a 1.6 of the same era.
As for the AF - stone age is incorrect - it is still a class leader in low light AF (on the centre AF point). It may have its limitations - about as good as the AF on a 60D.
Brian, I know how much you love FF cameras. And yes, I never owned a FF, but I know enough people who own FF and who are amazing photographers. However, do their ISO 100 - 400 pictures look much better than mine? Only when they have a better composition, but in general it's very hard to distinguish a modern crop from a FF in good light. Yes, in low light a crop will have no chance compared to a FF. But then the question is why don't you use MF or even 4'x5' film?
However, and coming back to the topic - it is as true that for action the 5D II (which has an AF comparable to the 450D not the 60D) can't hold a candle to the 7D. Of course, if you are the perfect photographer and use MF on action shots and get everything right you still will get good pictures, but the 7D will have more keepers and get more interesting moments because of the highly superior burst rate. And not everyone wants everything centered in the picture (of course I can crop in post production, but with a 7D I can use an outer AF point and still have great performance). I bet that a pro with a 7D will get much superior sports pictures than a pro with a 5D II.
So, in the end I still believe that these cameras have different target audiences - 5D II for studio/portraits and 7D for sports/ birds/ moving animals/ moving kids... And just to take this point out of the way (I almost know that someone will bring it up) - the 5D III and 1D bodies are in a very different price segment, which means that they are not the real competition to any of the above named cameras.