Why so serious? If he doesn't want HB, let him.
This. These updates from Big N are becoming more frequent, and I simply don't care to keep track of it. The only thing I use it for is no trip/longer replays for Brawl, but since my friend has 2 wiis that already have this (and always has them on him) I just don't see he need for it. *shrug*
I think you're getting a bit paranoid here. Once you delete HBC, it's just gone, that's it. There is no code still in the Wii, unless you installed DVDx or BootMii.
True, but these things tend to leave IDs and tiny strands behind...but, upon reading the homebrew wiki and official statement from Nintendo on the update, it doesn't seem this will cause any problems (as I've had HBC removed for a while now). I was just worried about my Wii becoming unplayable (bricked), but all 4.2 does is erase the channels anyways. I'll probably reinstall it later down the road, when the updates become more stable.
There is the title ID, which is likely still installed meaning you can run it off the SD card. Use AnyTitleDeleter to get rid of that if you wish. Or update to 4.2U. Either works.
Yeah, this. Thanks for the info, good to know. I should be fine now.