Lets End The Vita+Wii U Doom Threads Now! Post Lifetime Sales For Both and I'll Post It In The OP!

[Mnementh]

Well, I think Vita will on average do a bit better than 4 million, so 5 million per year on average. WiiU will do even a bit better with good holiday-sales and Nintendo having some more cards to play than Sony for Vita. So six million per year on average.

Both I expect to last around 7 years, that makes:
PS Vita: 35 million
WiiU: 42 million