Someone's full of poo.
D2Xs Top Continuous Shooting Speed at full resolution = 5 frames per second.
The D4 is the first Nikon DSLR that has 10fps. Considering that 1,000s of shooters have made amazing images without 10fps, I'm not sure why anyone thinks they do. I have never had a camera do more than 6fps, and I still get great shoots. Hell, Leica shooters get great shots and they don't have auto focus and only 135mm lenses on the long end and can only get off maybe 2fps.
I know I sound like I am harping on FPS but as a photographer you are going to miss shots. If you need that many frames/sec, shoot video - you can have 25, 30, 60fps. Realistically you have to be shooting above 1/1000 to be firing of that many frames and most I see complain about it are usually only shooting 1/200th or lower.
The official FPS harper, haha. All sports photographers want high FPS. If a "moment" lasts for less than half of a second, is perhaps getting a quick 3-4 shots in there is sometimes better than just one? Why else would action/sports photographers (and others who can afford it), pay such a large premium price of a D4?
I agree that that technique and timing are significantly more important, but that doesn't change the fact that high FPS is a valid need for some regardless of their need to improve skill level. They always have the option of slowing it down or only taking one shot when appropriate, and in many cases this will yield better results... especially for the less skillful among us - that often includes me.
If a Nitro Funnycar is accelerating to over 100MPH in a very short distance, it's nice to have a high frame rate when panning, but it's a must to have good technique. If a pair of MotoGP bikes are blasting through a chicane at a very high pace, would you use a single shot or a burst to capture the moment? When panning to get that beautiful speed blur of the background (with a sharp image of the object if you're lucky) there may be a few shots in the sequence that come out properly, it's almost beyond human ability to time it just right... it's hard enough to pan and compose properly as things are happening very quickly. And these things can also happen in a quick and hard to predict manner, and having that high FPS is a nice way to push the envelope... after all, beyond the basic point and shoot, all we are doing is pushing the envelope in different directions. This is where some of the wildlife guys may be wanting it... it's hard for me to relate if it's not something I'm doing on a regular basis, so i can't speak for the guys who do landscapes, portraits, street photography as much as I can with the ones who do action, sports, motorsports.
I sometimes need higher frame rate at 1/125 to 1/500 with long lenses even (70-200 - 1.7X - D700 - MB-D10 - RAW) to get the right effect... but you're right, a lot of the time I need it it's much faster.
Taking a "sequence" of a golf swing, you only get maybe two shots at 4FPS. With guy doing a flip on a wakeboard, you may only get 2. I could go on and on.
(edited for numerous spelling and grammar and sentence structure and rambling)