I'm not interested in running homebrew. All i want really is for my Gamecube backups, and the occasional Wii backup (when i'm too impatient for a game, Resi Chronicles for one!). I couldn't care less for being locked out of the online elements of the Wii.
But is there a real danger that Nintendo could just shut down my Wii? Or could i just disable the wireless on there and not have to worry?
Nintendo can't force an update on you with the Wii, you have to do it from a menu item. And so far there hasn't been a game that requires an updated firmware, like with the PSP.