I really don't think this will happen soon (i.e. not within 4-5 years). We have not seen a (new) full frame camera under 2500 dollars yet, and part of that is the sheer cost of the sensors...we are not going to see a D40 market level camera with a full frame chip for quite awhile. Part of this is a factor of silicon wafer manufacture -- the bigger the sensor, the higher the rejection rate and the fewer sensors can be made from a single wafer. This is why the tiny sensors in cell phones are practically given away as an afterthought, why point and shoots can be extremely cheap, why aps is cheaper than full frame, and why a 22mp medium format digital back costs 20,000 and while the 1Ds MkIII's 35mm sized 22mp sensor costs only 8000 (with a body) And frankly, there is no call for it. APS-C offers very good image quality, smaller cameras and lenses and cheaper overall costs. For the amateur and casual market, those are very important factors. Keep in mind that there are still a lot of people using disposable film cameras out there...DX is not going anywhere in the next few years.