I think that commercially, larger aircraft are on the horizon.
This is representative of a trend which has been going on for years in the industry, culminating most recently with the loss of the SST

Traffic congestion seems to be the most mentioned culprit. There's just not enough sky to have that many planes in it.
If we moved to smaller aircraft, we'd need even more airplanes to carry passengers around. The traffic congestion problem would multiply tenfold!
Another indication of the industry leaning towards larger birds is the development of the A3XX, 777 and the 7E7...the manufacturers just don't seem to be interested in smaller planes.
However, if it bares any resemblance to the automobile industry, SUVs in particular, the trend will soon reverse, as the airlines realize that operating costs are too high for the revenue the aircraft generate.
For a few years, SUVs just got bigger and bigger and bigger. Then they hit a brick wall, and the trend reversed. Things like the Honda CRV, Jeep Liberty, and Kia Sportage became the new generation of SUV...This could easily occur within the airline industry.
IMHO, of course.
