Very nice OP, as usual. It would be great it the PS4 never sells below 180K/week. However, I might have to bet against it mainly because of summer. I think it'll fall below 180K in July and August, but will do phenomenally in all the other 10 months.
EDIT: One way the PS4 can avoid going below 180K in any week in the summer is if Sony announced a $100 pricecut during E3.