I haven't seen recent stats, but awhile ago the number of iTunes users (even when iTunes was strictly tunes) far exceeded iPod owners. Assuming all Airport Expresses aren't sold to "audiophiles" or portable router users, there's likely a lot of people, who buy music expecting to listen to the files in other situations than walking down the street with an iPod/iPhone.
Doesn't negate most of the 24 arguments (can't image the masses care for real CD quality anymore, let alone better), but perhaps even the AAC users are at least thinking of better listening environments.
And... I know this is going to make some cringe... Apple does have a history, in desktop publishing (fonts, graphic support, etc.), early music creation applications, some displays, that smartphone, the recent GarageBand demo, etc. of rising exceptions for the market as a whole. They could be looking at the numbers, say 'hey there's cash there', and dramatically increase the audiophile population... even why most have no use, or ears, for it. Who really needs a calibrated cinema display after all? 1%?
Loosely reminds me of the caption of this video I saw in the Twitterverse today: "They are coming–hordes of kids raised on a diet of Final Cut Pro and Canon 7Ds. Prepare to be eclipsed." http://ow.ly/1s85iU