With that price, nikon having a $3000 camera that can compete and probably beat a canons body that cost twice as much. Canon is loosing touch with reality
It'd be the 5D2 vs D3x situation in reverse.
Back then, the D3x had better IQ than the 5D2, but cost three times as much, had the bulky inbuilt grip was totally incapable of ISO 3200 and 6400. Naturally, it didn't sell particularly well.
If Canon release a new, high-resolution body that costs double the D800, with similar resolution, a new sensor design that improves the DR and gets rid of the pattern noise issues and an inbuilt grip, it'd still lose dramatically to the D800. After all, if you can get two similar-performing bodies for the same price... Also, for many candidates for a high-resolution body, particularly landscape photographers for whom weight and space is at a premium, the inbuilt grip is a turnoff. After all, the original EOS-1V didn't have an inbuilt grip, nor do any medium-format bodies.