Tool for all?
WiiWare (US) and Wii Software (Europe) are certainly initiatives to bring original content to the Wii alongside the Virtual Console and Nintendo do appear to be courting smaller developers as well as the likes of EA, Sega and Ubisoft. But nowhere in any of the official announcements has there been any indication that this is akin to XNA or any attempt to bring hobbyist programmers into the fold. I've seen a few news sources repeat this, but it's not what Nintendo said in their Press Release.
There is a huge difference between encouraging professional independant development and allowing anyone with a home computer access to development tools.