I am not having a personal go at you - but its a completely ridiculous statement to say that those who bought the 1DSMK3 got 'taken'.
Firstly - the 1DSMK3 is without doubt THE finest 35mm DSLR I have ever used - regardless of price. It produces stunningly good files with incredible detail. Its near bullet proof, virtually waterproof, rugged and reliable. I use mine on paying jobs regularly without hesitation, and if you look what other professionals are also using you will find many more of the same comments. Mine has been used in torrential rain, -11 degree celsius blizzards, high dust environments and its never missed a beat.
The rest of your post is pure speculation that does not conform with any part of Canons history of upgrading 1 series cameras.
In summary - stop worrying about what 'may' be coming out in the future - keep shooting with your 1DSMK3 - its a brilliant camera and mine will have to be prized from my cold dead hand before I let it go.
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Again, I agree with your analysis. When I say 'taken' I mean that an 8K camera should have more than a 1.5 year lifespan between 8K upgrades that could make it much, much better--such as better ISO to noise ratio, and yes, a huge jump in MPs also. The next war aside from the ever warring MP issue is ISO and noise reduction, like the D3 points out. I've used ISO 1600 with the DS3 many times so far, and when you begin using ISO 1600, you get spoiled. I can only image what it would be like to use ISO 6400 and have the files be as useful and noiseless at the D3 is. Unlike having Photoshop to do everything a good photographer use to do, like even changing the direction of the key light by dodging and burning, having the option to shoot at ISO 6400 is a real creative advantage when using natural light.
And the 1DS3 can use ISO 1600, but only if you are aware that you will need to expose the images correctly. If you underexpose at 1600, you get grainy, muddy images that don't push well at all, and that means using +1-2 stops, which really means you are only getting a shutter speed equal to ISO 400 at +0 compensation.
Of course if the light is right, you can nail the exposure at 0 compensation using ISO 1600, as long as the shadows are not too dark.
What would really pull me in is the ISO noise issue on the DSIV.