The values is set both in absolute terms of what it offers to me and in relative to what competition offers in the price range.
5D3 only offers additional 1 FPS over the D800. Everyhing else the D800 beats the 5D3 hands down (as far as I currently know). Even if the 5D3 had offered same low ISO DR and high ISO noise as D800, but still 22MP, the only 1 additional FPS had not justified the price.
With full 1DX AF and meetering, 22MP, but same DR and high ISO noise as D800, and the 6 FPS the reasonable price would have been same as for D800.
To justify this price they need full 1DX AF and meetering and 46MP at 5FPS (same pixels as in their crops but improved, especially in DR), 38MP at 5.5FPS, 32MP at 6FPS, 27MP at 6.5 FPS, 23MP at 7FPS, 20MP at 7.5 FPS, 18MP at 8FPS.
This would be the fully fusion of 5D2 and 7D.