The D7100 is a great body and if I were entering the DSLR wildlife arena right now I'd get one as my DX camera. All I'm (and many others) asking for is a bit more resolution and higher ISO performance in a solid body with control layout I'm used to. A dedicated Af-on button is a must for me. The D800 is close but 36 MPX is overkill for photojournalism and the frame rate is just too slow for many sports and fast moving, unpredictable wildlife. I'm not a shutter burner by any means but I do appreciate the quick 8 FPS bursts I get from my D300's.
I handled a D7100 and it just didn't feel right for me. Nikon started the ball rolling with the D200, 300, 300s semi-pro bodies and a lot of folks naturally want the next gen of that.
Until then, I'll keep shooting D300's as they are still very capable bodies.