Many of us have complained about poor AF , slow fps, and others in the 5Dmk2.... NOW canon have solved almost all those problems, AF FPS etc. is not normal to keep the price at $2700 ( don't mention the inflation and other raw materials price increase).
In my opinion $3500 is a fair price for what this camera offers.
Other industries constantly come out with new technology at the same, or even lower, prices. Why not the same for the camera industry?
The price of technology almost always go down with time. It's why I can buy a new, very nice laptop now for less than the new, very nice laptop I bought back in 2008 (much better specs for a lower price). We *expect* that the latest models will bring more for less (or at least more for the same), within obvious reason. Typically, for product differentiation purposes, the classes stay similarly-priced, but new models just pack in new or upgraded features. It's quite clear that the 5D3 is not designed to "compete" against the D800. By itself, the 5D3 looks pretty good, though it's out of my price range. In comparison to the latest Nikon offerings, though, it falls quite short.
If I had no Canon-mount glass, I'd be hard pressed to choose the 5D3 over the D800 right now. However, I do have EF-mount lenses, and my desired camera is a low-end FF. I'd be nice of Canon could come out with a 5D3 "light" -- something with only 3-4 fps, less sophisticated AF, worse weather sealing, similar sensor, etc., for ~$1800-$1900. I'd think that the 5D2 will drop in price to fill that role, but I've read quite mixed reviews about the 5D2 in regards to high ISO noise and AF reliability.
I assume Canon will eventually put out a very high MP beast to rival the D800, but I'd also think that such a camera would be priced between the 5D3 and the 1D X. Obviously, that's likely a non-starter considering the $2999 price tag for the D800.
Honestly, as someone who has some money in Canon products but who has little allegiance to the company, I think the D800 was a game changer. Of course, Canon knows that people get invested in the Canon ecosystem (lenses, accessories, etc.), and thus have relatively high inertia when it comes to brands. Most people who own a bunch of Canon products are not going to up and leave the brand since the cost of switching into the Nikon ecosystem can be expensive (replace all lenses, etc.). As such, they probably realize that they can charge a premium. Of course, this does little to attract new users, but it's apparent to me, based upon the 5D3's price, that Canon isn't focusing on that right now.