I think this kinda hammers it home too, looking at corresponding sales periods
NPD US Sales Comparision:
Jan-Aug 2014 (Wii U + 3DS combined)
= 1.55 million combined hardware
Jan-August 2003 (GBA + GCN combined)
= 4.7 million combined hardware
So basically the narrative that this gen is basically the GBA + GCN is fairly false. Wii U + 3DS are selling nowhere close to the GCN + GBA in North America.