Man... NPD threads are dead now. I completely missed this one, so few replies.
Lack of available figures certainly doesn't help.
However a good chunk of replies (and GIF) in a NPD thread usually came from the respective userbase bickering to each others.
Currently though there is very little to argue with.
Wii is getting phased out by WiiU, 360 is at the top and Sony always trail back.
On the handheld front 3DS is doing decently but hasn't yet exploded like in Japan so it's potential is still in question (especially seeing how DS almost match 3DS sales every month).
Vita doesn't have Nintendo problem (ie: predecessor selling almost as good as the current system) but just because PSP is almost non-existent.
Vita sales in the first few months are really "impressively" low that's why it is talked the most.
It doesn't help that the whole retail market is contracting, so much that NPD hasted to highlight DD performance.
No one want to buy market analysis of a declining market.
Compared that with what we get in the past decade.
Sega discontinuing the DC even before most player entered the market and exiting the hardware market.
PS2 dominating the chart with the GBA with an intrusion from Xbox that was after that quickly killed off.
Wii, the most unlikeling system, dominating the generation on behalf of Nintendo alone with insane figures (700K+ in slow month like this one).
Then 360 becoming the top platform since 2011.
On handheld front we had GBA getting cut short (but it lasted until 2008), PSP that seemed take over Nintendo turf after disappointing DS performance.
After the lite release fortunes reversed and PSP suffered a slow decline while DS registered some record breaking sales.