In addition to the excellent advice that Darklordjames gave. here's some advice if you want to take advantage of the capabilities the Wii has of playing earlier software.
Your Wii has full GameCube capabilities (Only consoles sold in the last few months lacked GCN compatibility, so I'm sure your system has it). So if you want to explore the GameCube library of classics, consider buying some GCN controllers and a memory card (Those doors on the side of the Wii conceal GCN controller and memory card ports). That opens up a new console for you with many classics.
And a couple of Wii Classic Controllers will allow you to take full advantage of the Virtual Console library of classics available on the Wii for downloading. The Wiimote only works with systems older than the Genesis while the GCN controller is really lacking for most VC downloads beyond the Nintendo 64 releases. So a pair of Classic Controllers will allow you to enjoy some great Sega Genesis and Super Nintendo classics like Super Mario World if exploring some 16 bit classics sounds like fun to you.
Originally Posted by newfmp3
I would not recommend to anyone to spend more money on an already dead system.
If they have an interest in it, now's the time to be acquiring things. I wanted a spare Playstation 2 to put away and seemingly overnight, new consoles had disappeared from retailers around here and many online retailers since I had apparantly waited a bit too long to acquire one.
Not everyone moves on to the latest and greatest thing immediately and not everyone never revisits an older console after buying a new one (Which I'm sure is a shock for many AVS users
). Especially when the poster mentions in his first post that they've been playing NES games, that should be a telltale sign that the Wii's impending obsolescence isn't going to be a roadblock to them enjoying the thing.
Plus, like has been stated, these accessories will be compatible with the WiiU and likely will play a major role on the system even beyond Wii backwards compatibility (Nintendo isn't expecting people to wave around WiiU tablets in Wii Sports 3, no doubt).