I'm going to come at this from a different perspective: I have D7000s, and am considering an upgrade.
I focused on glass first, and am not unhappy. One great advantage of putting FX glass on DX bodies: since you're only using the center of the lens, you avoid any corner falloff. So I get great results using a Nikkor 70-200/2.8 VR-II with the TC-20EIII - a good combo on FX, a great combo, IME, on DX.
The 7000 will absolutely reward good glass. In fact, my next purchase will be a 200/F2. I'm confident that this lens will sing on the D7000, with and without the teleconverter.
The only lens I sort of regret buying: in order to save some cash, I bought the Sigma version of the 24-70/2.8, rather than the Nikkor. I wish I had splurged for the Nikkor. I'm not sure that there would be much IQ difference; the Sigma is certainly no slouch - but there's things like resale value to consider.
One compelling reason that hasn't been mentioned to upgrade: ergonomics. I had a chance to shoot a friend's D700, and absolutely thought it blew away the D7000 in terms of fit, feel, and function for my hands.
Somebody in this thread listed the larger FX body size as a disadvantage; for me, it's also an advantage. I have large, clumsy, arthritic hands, and appreciate a larger body.
My conclusion: the only way I can rationally decide which body makes sense for me is to rent each for a weekend.
For example: I'm currently hating switching ISO on the D7000. The other morning, I got to see a flock of wild turkeys. Not an everyday thing.
The camera was out on a monopod in the back of the truck already, I stopped, got out, grabbed my rig, framed them, and then realized I had to switch ISO. That meant taking my eye away from the viewfinder, finding the little button, holding it, turning the wheel. By then, the flock had moved. Time to recompose. Thankfully, the flock hadn't moved back into the woods.
There's many sporting events where I'd love to be able to adjust ISO quickly and still keep ready to shoot.
I also pretty much need the D7000's burst capacity at a minimum for some events I shoot. I can't really get by with much less.
So, I'm slowly getting a list of requirements I need in the "functionality" and "ergonomics" department. That will determine my next body choice, be it FX or DX. Meantime, I'm buying all good FX glass. Oh, and I'm learning much more about photography: my latest endeavor is to better understand white balance, and I'm considering going off the deep end and buying a white balance meter.
Anyhow, maybe that gives you something more to consider. Don't think for a moment that the 7000 isn't worthy of the best glass.