Most of those who would order a 1D X are pros, and are busy earning a living. I'm retired and can't afford one. Unless there is a specific need for the features, or a person is able to afford it for a hobby, you can do very well with a 5D MK III series.
Yeah I make my living on photography so I'm going to pass on the 5D3 for the 1DX. The 1DX has many advantages over the 5D3 such as weather proofing, durability, two CF card slots (the SD card in my 1D MK IV slows things down for me), the higher speed will be appreciated for sports (I will even use 14 fps for golf and baseball when I want the ball moving in the frame), useable images at ISO 25k, slightly better x-sync speed, and most of all the amazing AF. A friend of mine used a 1DX and said the AF was much better than the 5D3 which is already pretty darn good.
People keep yapping about how long the camera is taking to come out but you gotta realize that they have lots of new tech in the new body including the change to a carbon fiber shutter which they want to ensure is durable enough for folks like me who shoot thousands of photos in a single weekend.
I want this camera to be perfect and I don't want to have to send it back in for repair like many have done with their 5D3. Professional quality products take more time to make and quality control is going to be much tighter on a 1DX than a rebel or even the 5D3 which is why they were able to hit the market so early. It is frustrating and I tell myself all the time that I really could have used a 1DX on this shoot or that shoot.
Canon is unleashing a lot of new tech this year and it makes me glad to be a Canon shooter. The 1DX paired with 3-4 600EX-RT's is going to be an amazing setup for weddings and photojournalism.