Not because of controversy, but because there's way too much demand for the console as it is.
Due to the extremely high demand for the Wii in the United Kingdom and the relative scarcity of the console, Nintendo UK has decided to pull its upcoming Wii television ads. They will be replaced with commercials for the Nintendo DS.
Nintendo realized that it would work against them to advertise a product that people probably will not be able to find during the holidays. "We have been running the campaign all year round, but we want to take a responsible stance this Christmas and not fuel demand," said a Nintendo spokesperson.
The UK shortages are in despite of Nintendo's worldwide monthly output of 1.8 million Wii consoles a month.