I'm pretty much lost for words after this statement...
Those who shoot full frame do so for a number of reasons. One of the biggest for me is the shallow DOF characteristics and closely following that is high ISO noise performance.
As Neuro said, the laws of physics tell me your theory is fundamentaly flawed.
Time doesn't stand still. Moore's law is still working, after all these years. Compare the sensor of the 1Ds to the sensor of the 4Ti ... which is better
The 1Ds only has an ISO range of 100 to 1250, the 4Ti has an ISO range from 100 to 12800. Technology marches on. How good do you think the APS_C/DX and M4/3 sensors will be in five years
There are Pro winning awards and getting published in major newspapers and magazine using camera phones. There are amatuers still using wet-plate cameras. Big world out there.
In the near-future I think that many PJs and Editorial and Advertising photographers will be using Smart-Phones to shoot much of their work -- shallow DOF?, there will be an App for that
Stick-around, the future is guaranteed to be different from the past.