the idiocracy theory is an interesting one.....
i am not sure however, whether there is a genuine decline in human intelligence thru time.....
as we live in an age of information and thus education, enlightenment can be more widespread and accessible, and thus our expectations of what one should know are increased.
(the US president can no longer call for national faith in his wisdom, by way of weekly radio broadcasts anymore than a vicar can demand attendence on a sunday.)
a perceived failure to rise to such higher standards could suggest a decline in intellectual capacity in the majority; but if the overall standard reflects a net gain in residual cleverness, then we have a net increase in braininess and thus the theory is null.
in addition to this, we have VD, crime, poverty and good old war, working to reduce the effect morons have, in diluting our gene pool into complete stoopidity.
if the theory is true to any extent, the only manifestation will be in 'class / caste' based segregations...... which we already have.
Just coz you don't understand it
Doesn't mean it makes no sense!