Jon, Just curious. You do not seem like a mash the shutter guy when shooting sports in general. That is not to say that on occasion you don't go this route. How restrictive have you found the D7000 buffer in practical applications. I have never had much of an issue with it as I tend to shoot in short bursts of say 3-4 frames then release the shutter for a moment and then maybe another short burst.
I would doubt that the D7100 will be noticeably worse than the D7000 when it comes to maximum burst rate, I also will find it hard to believe that it will be noticeably better either unless this is truly the highest performing DX camera Nikon plans to have in the line. One hint might be that with image quality set to Jpeg large the buffer capacity of the D7100 will hold more images than the D7000 even though the file sizes are slightly larger. That being the case it is going to come down to write speed as it would appear that the physical buffers are about the same in size.
What kind of performance are you looking for to fit your needs?
Regardless, an interesting exercise. It will be even more interesting to see how close you come to reality once people have a chance to test them out.
Marc There are always two people in every picture: the photographer and the viewer.-Ansel Adams