Entirely valid question and maybe in a reactive sense people can now reevaluate their plan to "go full frame", but in a proactive sense we have been talking about this very issue for years here.
The lab coat boys are getting better all the time at capturing photons and eliminating noise. When they do this both our FX sensors and our DX sensors keep getting better and better. Thus both bars are constantly being raised.
The very issue we have been talking about, and Thom Hogan has been particularly clear on, is at what point in the improvement cycle is the technology good enough for most people.
Whether the D7000 is the cam that causes a lot of people to get off the treadmill on the "DX is good enough platform" will be very interesting and will be based on how good it really is. I can't wait (and do have one on preorder). But for my own shooting I fully plan a dual FX/DX kit for at least a couple more improvement cycles, but that is just me. The D7000 is just a step along the path for me.
And don't forget about black silcone and the ones we have never heard about... yet