I don't think the Wii shortage is or will be coming to an end any time soon. Nintendo has most definately increased production and will be releasing any stockpiles they have for the dual launches of Mario Kart Wii and Wii Fit in Europe and NA (look at the NA numbers this week and Europe numbers for the past few weeks).
Nintendo is a freaking smart company, they don't want to increase production too much just to see the Wii loose popularity and then have a bunch of useless factories. However unlikely that scenarios is the fact of the matter is Nintendo is fine with the situation at hand, they are selling Wiis like crazy, outselling their competitors and making craploads of cash, why change that too much?
Currently dreaming of: DKC4 or Sonic the Hedgehog 4 (classic 2D platformers) for WiiWare, Smash Bros. for DSi, New Super Mario World for DSi, a Wii remake or true sequel of Final Fantasy Tactics.
One down, hopefully more awesomeness to come.