Apple + AOL + XM = AAC?

Apple, why not help AOL and XM in the AAC vs. WMA format wars by adding AOL/XM's new radio service to iTunes as an option on both Mac and Windows platforms. This would "solve" for the most part the need for a subscription service for iTunes, and help promote standards-based AAC/MPEG-4 streaming instead of proprietary WMA. Plus, think how many more songs the iTunes Music Store could sell with a "Buy Song" button next to the "Now Playing" feature in this new radio service.