It has to do with the change in focus by developers. Earlly games had to be hard to keep players entertained with low quatities of gaming code due to technological restrictions, memory, storage medium, etc. Today all those limitations are gone and developers have to find different ways to keep game longevity up. Now a days exploration is a big part of game lenght whereas before it was playing similar levels at higher degrees of difficulty.
That being said I do find that even hardcore gamers are becoming increasingly turned off by games that require even a medium level of difficulty. I'm talking specifically about gamezine reviews of games that require a higher skill level and went on to get much lower than decerving scores. EGM sometimes baffles me with some of their scores: Waverace Blue Storm, excelent lauch game, requiring finesse and skill to complete the higher courses received scores no higher than 7s because of difficulty. F-zero got two scores that put it below the 8 mark because it was too difficult. Totally unacceptable. Finally, PN03 has been shunned by most game critics by being too short/too difficult/too bland. I personally love it and think the main reason for the low scores being difficulty. Reviews have gone as far as admitting they could only play the game on easy mode, then they complain that the game is too short, that's coming from supposed hardcore gamers? I think this generation of gamers has become too dependant on light and whistles instead of a challenging gaming experience. If you want an indication of true laziness just look at all the cheat devices on the market. Even in entertainment the lazy take the easy road.