Originally posted by Pål Jensen Nikon and Canon do not release FF cameras to replace anything (and they won't anyway) but to fill every hole in the DSLR niche. They have so much volume that this is natural thing to do instead of updating existing cameras at a faster tempo. APS is a format in its own right and lenses and camera do not need to have a sort of constant price advantage over anything else. For most photographers, bigger sensors just mean disadvantages, not at least in price, if they do want to print larger than the smaller formats permit...
APS-C is going to be edged down the price point scale and that's inevitable as FF will edge down in a supplanting role. It's us not happening as fast as some thought in the same way that mirrorless has not taken over the world, unless you're a Leica fan, because now they have Leica video! eek:
FF comes with legacy glass that adds to APS-C price pressures. APS-C glass simply cannot continue as high-priced as before because that market space will be taken up by FF. If there are price equivalencies for a give FL, the FF will win because it will justify the added cost of the new body. So APS-C has to compete on price in the DSLR camp. (Caveat: the Fuji APS- x-series, which competes on RF-like features and handling)
It's not quite there yet, not until FF bodies get down below US$2,000, but you can smell it. APS-C has lens price concerns, and that's been $$$ to Pentax. That revenue stream is about to get badly crimped. The FF threat is in lenses, not bodies.
Nikon volumes for the D4 aren't that high, I might add. Something on the measure of a 3k per year after the initial sales burst in the first 6 months.