As most here know, the "default" encoding setting in iTunes is 128 kbps AAC, and iTunes Music store songs are encoded at 128 kbps AAC. Given that many users will not change the settings in iTunes, think of the momentum behind (even 50%) of 10 million iTunes users encoding AAC files.
Apple will likely never again enjoy the dominance it enjoys right now. Sony, Microsoft, Rio, Creative, and others will begin to chip away at Apple's market share. The next year is critical for AAC. If it is to become the standard of digital audio, its window to do so is now. Will DAP manufacturers concede the momentum of AAC and adopt this codec to their players? Will Sony give up on ATRAC, which was a disaster for them in 2004, and support AAC - or will they pursue WMA? Will home audio systems and automotive CD manufacturers adopt AAC capabilities like they have with MP3?
A lot depends on Apple and their support of making AAC mainstream. Apple's history in this area is awful. They are short-sighted when looking to capitalize on early success. They have shown this again by snubbing REAL, but the partnership with Motorola offers hope.
I think by the end of summer, we should know if AAC is going to replace MP3 some day as the codec of general use, if MP3 will dominate forever (I doubt it without digital audio rights), or if WMA will emerge the ultimate winner through sheer MS muscle. There is little doubt that MP3 will still be king on Jan 1st 2006 - but with 60% market share or 90% like today? I think it will be closer to 60. We shall see.
Look around, the iPod is EVERYWERE now. Has AAC's time come at last?
Off topic - The average user does not care, but QT VBR AAC should make us audio geeks happy in 2005.
