chimera201 :
"As PC Gamer points out, over 50 percent of the Steam user-base are using 4 GB of RAM or less"
Because they didn't need it till now since the new consoles are coming and what PC gamers get are the console ports.
True but not all console ports are equal. When done right, a console port can take advantage of a PCs power.
Max Payne 3, out in 2012, was recommended to have 2GB or more of VRAM and needed 3GB at 1080P to max out the game with AA.
It depends on the game company and how willing they are to use the hardware PCs have.
I am sure it will get better with the new consoles but I doubt they will all require a HD7970 or GTX780 etc.