And having a 24mp camera cheaper than a 16mp D7000... ? if anything that's worse and makes the D7k obsolete.
And if everything came down to the number of pixels, that would be true, but interface, build quality, Auto Focus, high ISO capability etc, the things that people have mentioned come into it. And anyone buying a camera should be taking all these things into account for their intended use. If you need the build quality and durability of components because you are using the camera(s) every day, then a 600D or a D3200 may not be up to the job, no matter how many pixels they may have.
For the general consumer, more megapixels sell. Those who know a bit more are looking at a range of features to match their needs, and pixels may need be top of the list.
If you are thinking of buying a new camera, you have to ask yourself why? What can this camera not do for me? If you're a Pro, how is the camera I have now harming, or holding back my business? :shrug: Most of us have gear lust, but if you are a Pro, without another form of income, the gear has to justify and pay for itself.
If it's a hobby, and you have the money, then get what you want and enjoy it.
