Well I have 2 wii's and 3 DS's and soon to own 4. Doubt wether wii will outsell DS but will defintly outsell GBA and PS1. DS to take out PS2 Q4 2010 when it tops 144 Million sounds about right.
Buying in 2015: Captain toad: treasure tracker,
mario maker
new 3ds
yoshi woolly world
zelda U
majora's mask 3d