Upload & Sell: Off
I see your point, but still I wonder what you'd think if a spec that is 'very important' to you, was left without any upgrade, generation after generation? ..Perhaps 9 point AF in your new 5D3? Or how about 2 - 3 FPS shooting speed?
I'm sure there is some spec that would make you whine like a siren. At least on the inside.
I suppose that depends on the individual user's purchasing habits. I tend to use my cameras for many years. I shot with an EOS A2E for over 10 years. My 5D2 is nearly 4 years old and still takes the same amazing images it did in 2008 and I still dig using it. I can play it like a piano and it never misses what I shoot. Although I could afford one, I wasn't tempted by the 5D3 or 1DX and wouldn't bother updating unless my 5D2 is beyond reasonable repair. However, if you're the sort to upgrade with each succeeding generation, you're bound to be disappointed with the tiny evolutionary changes.
Okay, the one spec that would make me reach for my plastic is the return of ECF. I loved that feature on my film cameras and am not too fond of using a slow joystick just to select an AF point. Oddly, I just read a rumor Sony is planning to add their flavor of ECF to an upcoming model.