Games are made to be fun - it's not called electronic entertainment for nothing. If it's to remind you of the pain of living constantly what's the point of playing them?
I think it's a sign of the medium maturing - more adults are playing and demanding more complex experiences than just collision detection and pattern recognition can provide.
Where do you see that? The same genres of games are as popular as ever. At best you can say a niche is forming but that's about it. Nobody is "demanding" anything.