Wii actually does not run an OS. That's why the Home Menu looks slightly different in games from varying time frames (Sonic Secret Rings' menu, being a 3rd-party Feb 07 game, still looks different from MadWorld's, 3rd party Mar 09), this is because when the Wii game goes into disc mode, absolutely everything is run off of the disc. It can pool data from the NAND memory (duh, or else we couldn't save), but it cannot do anything that isn't expressly programmed on the disc at that point (this is why patches are impossible, unless a game were expressly programmed to be patchable ahead of time)
Though i would expect many of those features that BlackBird proposed to make it into Nintendo's next online system, which won't come around until they make a new console. There's no reason or motivation for them to re-launch online on Wii (and it would be a terrible headache), and it would be impossible for them to re-launch online on DS, so new consoles are needed, and the console transition would provide it's own impetus to build a new infrastructure.