It seems that some Wiiware developers are complaining about the amount of retrogames on Xbox Live arcade. They seem to be tired of being outsold by these games.
Having better royalties is a great reason for switching to Wiiware, but I don't see how the problem of too many retrogames will be any different on the Wii. They have the virtual console with even more retrogames. Just because you're separating Wiiware and the VC doesn't mean that they aren't competing for the same dollars. It would probably piss of consumers more if everything is not integrated.