Pachter must have had an alterier motive for his prediction..perhaps he's an M$ shareholder and wanted to boost the stock a bit so he could sell :S that's the only reason I can think of
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right