Wii U sales in America went up from 8.612 to 21.314 within the week when the Wind Waker HD Bundle released + price cut, hmm...I think it's not that quite bad...it's at least an increase of over 150 % I think the reason for that still low numbers is because it is only digitally packed in, but on the other hand you have also Wonderful 101 in that week...Mh, Let's wait until the first October week when the retail version comes out.
To compare: In the Pikmin 3 week Wii U sales jumped from 7500 to 13500 in USA. This was an increase of still less than 100 %.