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Predictions based on generalized long-term knowledge of the history of technology with neither scientific basis nor specific speculation. Intended only to provoke thought and discussion. If you're response is that I'm an idiot, fine, I'll say that right up front and save you the trouble. So...
1. The Canon EOS 1DX (if it ever becomes reality) is the last 1-Series flagship DSLR Canon will ever make. Like the EOS 1V was/is the last 35mm film SLR from Canon, the 1DS will be the last DSLR. Like the 1V it will be around a long time. Its "obsolesence buffer" will be plenty of room for "upgrading" through software application.
2. A new "flagship" version of the APS-C line will be introduced (e.g. a 7D2), and like the 1DX it will be the final flagship of the APS-C line. It also will be around a long time and see upgrades through software. Given Canon's predilection for super pricing I predict it will be over $2500 U.S. And most people who have a 7D today will buy one! It will seem spectacular.
Meanwhile, Canon will lead a transition to new formats that require far less mechanical apparatus than the tradional SLR. I'll leave speculation about exactly what that may be to others.
The fundamentals of a camera are pretty simple. A lens focuses light on a sensor (chemical using film previously and now a light-sensing semiconductor) and there has to be a means for recording and converting what is sensed into something the human visual apparatus can discern. What we consider a "camera" is a device that enables and manages operator variables between that lens and sensor. Photographic composition drives the decisions that create those variables. Few people buy a camera and just start pressing the shutter button with no concept of a "picture" in mind. That's where need for most of the mechanical and electro-mechanical stuff originates in today's cameras. The operator directs all that electro-mechanical stuff to do different things to fulfill his "vision."
The "mirrorless" design concept has already begun to transform the mechanics inside cameras. I think it will not be long before the flapping mirror and mechanical shutter will be seen as whimsical relics of a primitive age. Since we seem addicted (many of us anyway) to seeing exactly what is seen through the lens (in contrast to rangefinders and today's electronic "viewfinders,") manufacturers may adapt this in new ways. A shutterless camera, for example, might have nothing between the lens and the sensor-- except for maybe a lens cap. When power is turned on, the operator sees exactly what the sensor is seeing (ala today's "live view" projections). I can see this being done through a classic viewfinder and/or using an extremely hi-def display that is part of the camera body as we now have. Pressing the "shutter" would only tell the sensor to save that particular instant. This will likely require different and better sensors than we are using at the moment, and some lens "focus" adaptations may have to be made. I'm guessing most of the fundamental research has already been done, allowing this to be seen as viable options for a camera manufacturer.
I don't know that any of us can predict exactly how this future technology will work, but I do believe it will happen sooner than most us us can imagine. It was less than 15 years ago when I was recording visual images chemically. I could then see that the silicon revolution was going to somehow overwhelm this process just as surely as it was doing with audiotape and videotape and print media, etc., etc. I couldn't
say how, but I knew, sure as shootin', that is was coming.
Perhaps 20 years from now there will be discussions on these kinds of forums about how the old shutter and mirror systems "couldn't be beat" as a recent poster here has posited about film. And ebay may be full of old 1DX cameras for those who want to try their hands at old style picture taking. And, as always, there will be old timers telling newcomers how tough things were in the good old days. "Why, we had to manually clean the dust off our sensors in those days. We didn't have that refractive oxidation process you take for granted today!"
Anyway, that's my sunny Sunday afternoon contribution to the intellectual process here at CR. May the force be with you!