We, as consumers, should demand more. I still maintain that the 5D3 should be <= $3k. I'm not a professional, nor do I make big $$, so $3500 is a significant chunk of change for me. If I had a 5D2, I couldn't see myself justifying spending $3500 (+ tax) for the 5D3. I currently have a 60D, and I've been looking to jump up to FF, but I'd rather get a budget FF (<$2k) with 3-4 fps, less sophisticated AF and AE, etc.; I may end up with a 5D2 assuming the price drops.
Sorry, while a nice sentiment, and perhaps even a popular sentiment, that's not how business works. Consumers don't get to set pricing based on what an item "should be". Pricing of a sole-source product is set by the seller based on what the market (as a whole) will bear. If all preorders are filled in days, the camera is out of stock, and then people are waiting until April/May for a 5DM3 body, Canon might learn that the $3500USD price was too low (from their perspective)!
As a consumer, all you can do is buy or not buy. Begging or wishing might get you some thumbs up on a forum, but will be largely ineffective with the seller.
For a lot of people, a used 5DM2 + a great lens (or 2!) is a far better use of funds.