Nintendo doesn't expect Wii U sales to pick up by much

Only 3.38 million Wii U consoles were sold between April 1, 2014 and March 31, 2015, down by over 200,000 units from Nintendo's full-year forecast of 3.6 million.

Furthermore, Nintendo does not expect sales of Wii U to pick up by much during FY 2016, forecasting a marginal improvement to 3.4 million units. This year's sales were up on the previous year, however, which stood at 2.72m.

As of March 31, 2015, Wii U had sold a combined total of 9.54 million units worldwide.

Source: Nintendo