I have one word and three numbers for you
Xbox360
It has a standard of 4xAA.....................
And if AA has not become a standard thing, why are Nvidia and ATI so obsessed with who has the GPU with faster and cleaner AA....................
What Sandwich said. The AA is used everywhere there because of the low resolutions (and from what I've seen of my brother playing, the performance doesn't seem to be so hot either). As for the companies "obsessed" about AA, these days they are mainly just hyping up the special AA modes that are exclusive to SLI and Crossfire.
I should have probably worded that differently: AA has never been a standard thing for people that are sensitive to framerate drops. A lot of people use AA as well as decent resolutions, but then again, a lot of people also find occasional dips below 15fps to be an acceptable tradeoff for the better image quality and so are quite satisfied with midrange or even low end cards.
16x12
My cell phone can do more FPS at a higher resolution. 
When you write those same numbers over and over again a hundred times, you tend to start abbreviating them.

By the way, speaking of cell phones,
here is what the future holds.