Hi . This topic of the heating from wii comes up on this site every now and then.
When I first got my Wii I was concerned. Now I don't care. I make sure to take the discs out though because the heat does transfer to the discs and I am a little concerned about it.
Fact is, hot components will shorten the lifespan of a device. By how long? I don't know. The heat will also shorten the lifespan of the storage media. For how long? again i don't know.
If people thing it is negligible, good for them. They can leave it on and enable wifi 24/7. If people think it is a concern, turn it off and remove the discs.
About the cooling fan - I am concerned by this device if its the one that draws power from the unit itself, because in drawing power, I would think that would be contributing to the heat slightly. If* i was to get a cooling system, I would want it to be external dont you think?
Thats just my opinion.