Its funny the features that everyone considers 'necessary' or a body is 'DOA'. There would have to be 1,000 versions of each model to make everyone happy.
Or everyone would have to buy a 1Dx/Nikon Equivalent.
A little lesson on how screwed up econonomics are: someone said 'electronics are supposed to get cheaper...' well, they do - but that doesn't mean the price has to go down. Inflation is generally calculated on how much it costs to get what you paid for yester-year, in today's dollars. Only, you can't get a new 1DII anymore, so they compare it to the next thing - say the 1DX. Its more? Yes, but it offers more features. So they determine the relative value, and guess what, its only really 2% more, or in some cases its less. Buy a car in 1990? A nice Lexus for $20k? That same one costs $40k now? But wait...look at all those safety systems, bells, whistles, buzzers, and knick knaks the '90 model didn't have. Lo and behold, the new one is actually the same price - from an inflationary/technological stanpoint. That is how the calculation works. Its how stuff is 50% more expensive now, but inflation has been 'very low' for a 'long time'. Its also why food isn't included in inflationary costs. Your potato today has no technological advantage over the one from 20yrs ago, but its still twice as expensive. What would the world's governments have to do about that if that was part of inflation?
So companies think that way. They don't want to provide better prices, they want to provide better value for the price. And that can occur at a higher price point as long as the 'value' allows it to. That is exactly what happened with the 5DIII. It has a LOT more features than the II. And therefore a lot more Value. So it is 'fairly priced' in the eye of the seller. Its up to us to validate the value calculation buy either buying or not buying the stuff.