Old games are too difficult - Increase of Casual Gaming effect or something else

Maybe target demography is more Casual Game oriented, or something. Further studies results could bring interesting results:

Source: http://www.p4rgaming.com/majority-of-gamers-today-cant-finish-level-1-in-super-mario-bros/

"I feel that Nintendo games today are much easier which is why the Wii U might be failing. Back then, games were much more difficult and therefore gamers really enjoyed them so they continued to buy Nintendo games and systems. Do you feel the same way?

Satoru Iwata (president): I actually agree with your assessment.... It may come as a shock to some of you that most gamers today can not finish the original Super Mario Brothers game on the Famicom. We have conducted this test over the past few years to see how difficult we should make our games and have found that the number of people unable to finish the first level is steadily increasing.

This year, around 90 percent of the test participants were unable to complete the first level of Super Mario Brothers. We did not assist them in any way except by providing the exact same instruction manual we used back then. ..."

Most scary option is going towards world like in movie:

Idiocracy (2006) 

http://www.imdb.com/title/tt0387808/

Fat Bookers ...