The most important consequence from the WalMart move is underscored by the following "prediction":
With Walmart.com taking the first leap, it's possible that other stores will follow in selling bare systems <http://newsforge.com/article.pl?sid=02/04/29/0218241&tid=7 <http://newsforge.com/article.pl?sid=02/04/29/0218241&tid=7>> and those with Linux preloaded.
Nowadays, barebones account for more than 57% of all the PCs sold in the U.S. It will not take a geinus to figure out what the potential impact may be.