This's quite interesting, two of the biggests chains in the US said that they won't pick up more mini games collections for the Wii.
http://www.siliconera.com/2010/01/10/what-to-expect-from-third-parties-on-wii-in-2010/
Could be a good move to keep shovelware off the stores, but to be honest big retailers often ignore good games because they don't have enough hype from 3rd parties, so it's like a eternal cycle of blaming each other (but at the end everybody can blame Nintendo and be happy)