The control layout, some of the performance specs, and market positioning (web site placement, marketing language) that Nikon are using with the D7100 seem to imply that it's the high-end of their consumer line, not the next quasi-pro offering. I'm sure there are pros that happily use D7000s and it's clear there are hobbyists/enthusiasts who feel a bit let down by the D7100. One size never fits all.
To answer the OP, one of my favorite subjects is wildlife and nature. Specifically for subjects in dim light (notably deer, that favor dusk and dawn), an FX camera seems a better answer (at least today), and to that end I purchased a used D700. Had Nikon offered a D400/DX platform with better noise characteristics, and similar ergonomics, I might have bought it instead.
I do sincerely appreciate the commonality of control layout that the D300s shares with the D700 (and mostly with the 800), and the robust build and size of these platforms. To that end, the D7xxx, and D5xxx aren't particularly attractive to me.