I don't care about this at all, but not being able to use the Mii Plaza or Wii Message Board anymore is a bit of a pity. I didn't send messages much but it's nice having the option, and without Mii sending my Wii would not be full of cool Miis
I hope they release an update that removes the useless channels. I can just use AnyTitleDeleter or a WAD manager, but for those who don't have a hacked Wii it would be a bit annoying having 5 useless channels on their system menu.
Is the Today and Tomorrow channel going out of service as well? Not that I ever used it, but unless those servers are ran by someone else it makes sense they would shut down those servers as well.
I'm sure there are people who actually used those channels though, though it would not be hard to just check the news and weather elsewhere. The Nintendo Channel is the only thing I think people will really miss, it had a bit of a lack of content but they could've easily done something about that and the DS demos that were on there can't be gotten anywhere else.