EEDAR took a look at every Xbox 360 and PlayStation 3 game released in the United States, and the numbers speak for themselves. Fewer games are including any form of multiplayer.
“You can see that in 2006, one year into the release of the Xbox 360 and the launch year of the PlayStation 3, 67% of the games had online multiplayer, 58% had offline multiplayer and 28% had no multiplayer,” Geoffrey Zatkin, the Chief Operating Officer of EEDAR, told the Report. “By 2012, you can see that only 42% have online multiplayer, a drop of 25%, 44% have offline multiplayer, a drop of 14%, and 41% have no multiplayer, a rise of 16%. So, over time, fewer and fewer high definition console games are including multiplayer as part of their core offering.”
http://penny-arcade.com/report/article/the-incredible-disappearing-multiplayer-mp-features-are-disappearing-and-no
Thought this was interesting, more at the link and EEDAR has a presentation Thursday.