The Wii memory however applies to all the games you play and even extra content such as messages and channels, so now this possible limit of 100,000 could potentially present a problem sooner than one might think.
I would also wager that the 100k is extremely conservative.
The other day when I was managing my GameCube memory cards, I was thinking about this again. The memory card I got with my GameCube back in 2001 is the one which has always had my Super Smash Brothers Melee data on it. I've played SSBMelee more than I'd care to admit... but I need to use it as an example. I've played over 100,000 matches, and the game saves at least twice per match: once before the match begins, and once when the match is finished. So, that alone would be at least 200,000 writes to my memory card, and that's not counting the saves from playing other modes or from the various other game data which has been saved to it throughout the years.
Obviously the GameCube memory cards can withstand a lot more than the predicted 100,000 writes for flash memory. With the Wii internal memory being tied to the entire system and non-replaceable, I'd think it would be at least up to the quality of GameCube memory cards, if not better considering it was released five years later. Therefore I'd say it's going to be a long time before I (or anyone) had to worry about the Wii internal memory reaching its write limit and possibly becoming corrupted.
A little more on-topic, I still haven't downloaded this update. Hooray me!