3. There is no market anymore for expensive FF (like 1Ds or D3x)
Genres like Photojournalism (especially in rugged environments) and sports/action will still have the same use for a high-speed, built-like-a-tank, low-light-performance, super-AF-tracking bodies like a 1DX.
Also I feel the 5DIII feels like cheap junk when held compared to a 1Ds III. If it was my main camera, rather than backup/second camera on a wedding I'd much rather have the 1DX than the 5DIII/D800 (my choice for a backup camera is very influenced by weight, especially since I'm carrying a medium format camera as the primary camera).