I think it's important that we all bitch a bitch so that Canon hears loud and clear. .
I am now seriously considering selling all of my Canon gear.
Money speaks louder than words. You make money with your images, and the D800 allows you to capture and sell images that you couldn't get with the 5DIII. From a business perspective, you absolutely made the right move. If there are enough disgruntled Canon users that jump ship to Nikon because they find the DR of Canon sensors inadequate, they will get the message loud and clear and address the situation.
Until then, in Canon's eyes people on message boards are just a bunch of fanatics that enjoy debating about how sensors perform in a lab, and how those test results might impact their photography if they had the talent to utilize their gear. You have a very impressive portfolio and obviously have the skill set necessary to benefit from the D800's DR advantage over any Canon body on the market. Surely, you must realize that for every pro photog like you, there are many more tech geeks either praising or lamenting about the D800's DR that haven't a clue how to shoot anything beyond a snap shot
My point is that the D800's has a clear advantage in DR, so there's no sense for Canon guys to cry about. Admit it and move on, and if DR is that important to you, switch systems. No need to be in denial, or get so emotional about it
If Canon loses enough business over this, they will get the message.