Vita - 160m
Basically around PS2 levels. PS2 did well after PS1 sold 100m and, even though PSP didn't quite manage that, Vita has lots of developer support and really good hardware so it should manage.
WiiU - 35m
A return to N64 type sales. The casual market is gone and Nintendo first party ain't much without it.
“These are my principles; if you don’t like them, I have others.” – Groucho Marx