I do not agree with EOSHD. If the DSLR market went a bit down it is due to high quality pictures produced by cameras manufactured for about 3 four years. The older camera could be improved in several ways, and now we are on the edge of a change, but not the one foreseen by EOSHD.
For me the future will clearly be the "modularity".
You will buy, once for ever, or let's say, for some for years if your are pro and some decades if you are expert, the essential of a well strong built magnesium body which will have interchangeable modules including the entire electronic hardware. We cannot produce "ad vital eternal" expensive rare earth camera bodies which are on an electronic point of vue, obsolete after 3 years and throw them trough the windows.. That's is simply not possible if we want the planet to recover.
We will probably buy different kind of sensors, as we bought for years 35mm or 65mm film. The sensor market cannot produce the finest sensor @ 50 iso and the best one @ 100.000 iso. It is only a software gimmick which allows to get both extreme settings possible. The market will be huge, for BW only dedicated sensor, high Iso, low Iso, type of colors and so on.....
Some Sensor will need some different quality of chips. You will be able to slide them in and out, as well a the Lcd screen.
Once that type of market will have reached maturity, you will see emerge some Open Source Cameras build using 3D printers, as well as Open Source hardware and sensors.
Optique is a matter of physics. You cannot change the rules of physics, that's why a small camera with a 1/3 inch sensor will,l even with gigabytes ccd, never produce the image produced by a Medium Format Camera and the compatible lens.
I believe that we will re-visit the history of photographie and we will see in the next years very large sensors as well as for photographie as for cinematography.