Because they are too focused on "thin."Why can't Apple make a new line of notebooks that focus more on powerful computing? Why can't Apple make a 2 or 3" thick notebook or one that weights 12lbs for those looking for something powerful? I'm not saying destroy the current 1" design, but just add a different model.
They might as well make the current MacBook Pro the MacBook and call that notebook the "MacBook Pro."Take the old PowerBook name and apply it again. I don't see anything wrong with this. Apple is becoming big, and has a chance to become bigger if it really offers something astounding.
The most we can hope for is the removal of the optical drive on at least some models, that would go maybe 1/3 to 1/2 of the way between the current MBP and that notebook.