Nintendo shutting down online capabilities
One thing they'll be doing, is getting rid of the online features for some of the Wii and DS. This will happen on May 20th 2014.
There'll still be online stores, but from summer, you won't be able to play online, there'll be no leaderboards or matchmaking. It'll all be shut down.
Nintendo said in a statement: "As of May 20th, 2014, the Nintendo Wi-Fi Connection service will be discontinued and it will no longer be possible to use online features of Nintendo DS/DSi and Wii software such as online play, matchmaking and leaderboards. The Wii Shop Channel and Nintendo DSi Shop will not be affected however, and will continue to be accessible after May 20th."
So if you're still using a Wii and like playing Mario Kart online, or like the Pokemon series on your DS, you'll have to start enjoying them offline.
Wii U's will probably be selling for £2.60 by the time May comes around, so you shouldn't worry too much. If not, you'll still be able to use your last-gen consoles for going on the Internet Channel, Nintendo DS Browser, Nintendo DSi Browser, Nintendo DSi Shop, Nintendo Wi-Fi Connection Pay & Play, Wii Shop Channel, and YouTube.