I don't think it's a negative thing, I mean if someone is going to buy a wii, they will. So they make the same profit in the end either way.
Predictions for 2008, I'll leave 'em untouched all year.
Being a little hopeful on the PS3 and a little pessemistic on the 360
Wii: 32mil DS: 82mil
PS3: 16mil PSP: 42mil
360: 24mil