Many others have mentioned that the wii is/not dead and/but nearing the end of its life cycle.
IMO, the will not die when the Wii U is launched, even then we still got the Homebrew scene; Media Players, Emulators, Homebrew games, etc. The Wii still got some games coming up, but you are (most likely) better off with a Wii U if you can life without homebrew and backups since the new and current Wii games SHOULD be playable on the Wii U, unless they are all backups.
If all your games are mostly backups then you would be better off with a regular softmodded Wii.