Nah, what i'm saying is that AA in general takes up more system memory than people can really afford with the current gen hardware.
HDTV resolutions aren't really 'above a normal tv' this generation. Most games are running in 480p which is 640x480 but is displaying a full 60 frames per second. 'normal' tv's run at 480i which is 640x480 but are only showing 60 fields (half frames) per second.
The actual resolution is the same, but a 480p image has twice the visual information to show (which is why it takes more work to render).
To get AA on that sort of image you'd have to render it at something like 1024x768 and then downsample it to display at 480.
Better AA routines take even more memory as they render the image several times (quincux makes 4 copies of the same image, but at the same resolution and shifts each image 1 pixel over from the original image and blends the 4 of them together.)
The simple fact is that all AA routines take more ram, and ram is a rare commidity in modern concoles (and likely will be in latter ones too).
In the next round of consoles if the game is meant to output in 1080p, feasibly you could downsample that same image out to 480i and it would AA the image on a normal TV, but it might do more to make the image 'fuzzier' than is intended due to the fact that a normal tv with a composite connection will tend to blur an image anyway. That's nothing current gen consoles can handle however.