Artie, Arash and I often do see eye to eye. But I do, in general, believe there is usually more than one way to accomplish a task, and accomplish it well, whether BIF, other photography or other things in life.
Regarding a black and white bird, perhaps we are thinking differently. Consider this image of a black and white bird taken by Arash:
http://www.birdphotographers.net/for...read.php/99347
Where I see the dynamic range problem becoming an issue is the shadowed area under the wing. Sure, for portions of a black and white bird in direct sunlight, pretty much all DSLRs have adequate dynamic range. But add shadowed area, e.g. black under wing shaded areas, and dynamic range becomes a problem, as the dynamic range can easily exceed 10 stops. Arash's image was made with a 1D Mark IV at ISO 800 and the 1D4 has a dynamic range of 10.8 stops. Raising the shadowed area of the wing shows a lot of noise. A 1D3 in this situation would likely show fixed pattern noise (FPN) in the shadows, or what some call banding. The 7D might show a little FPN, but it would be small.
Regarding lots of "incompetent photographers, I really don't think that is proper way to put it. There are lot's of photographer who don't understand exposure and the effects of digital imaging (noise, expose to the right, ISO and the effects each has on a resulting image). That makes them ignorant, but not necessarily incompetent in my opinion. And isn't BPN about education, not about calling photographers incompetent?
Back to the original question. I gave in one post, the pixels on subject. Given the choice of 7D, 5D3 and 500 or 800 mm lenses, I would choose the 7D and 500 f/4. The reason gets into Etendue and fixed pattern noise. The only upgrade from there would be a 1DIV as the AF is twice as fast as the 7D (don't know about the 5D3--haven't tested it personally yet), and the FPN is less on the 1D4. But like I also said before, these days I'm choosing shorter focal lengths, and prefer my 300 f/2.8 for more outings.
Roger