Why not give people what they need, without taking all their money.
I don't think you have a good grasp of how business works. Canon's goal is to get every last scrap of money they can get out of you.
What you are asking for is a 5D Mark III for the price of a 6D. That sounds great to me too! Unfortunately for us, Canon would rather continue to sell the 5D Mark III at the price of the 5D Mark III. And so long as they can, they will continue to price it accordingly.
In a near future, i'm sure they will regret that decision....
The 6D really just follows the long line of Canon pricing strategy. Higher feature cameras are priced higher. Features on lower priced cameras are deliberately held down to encourage people to move upmarket (and give Canon more money).
The only real threat to this strategy can come from other camera makers. Nikon to some extent has challenged Canon's use of AF feature set as a market differentiator by offering their best AF on 'downmarket' bodies like the D300 and D700. Canon responded (slowly in the FF case) with the 7D and 5D Mark III.
From what I see of Canon, they continue to see a good market split between offering with high frame rate + best AF (7D, 5D3) and a cheaper set with slower frame rate + second tier AF (60D, 6D).
Nikon has elected to go in a few different directions, so some comparisons are harder to make. The 5D3 and D800 and certainly moving in different directions.


