The real issue for intel is 7W is not worth 100$ to most consumers. OEM's have been selling good plenty of 400$ laptops for a while and tablet manufactures can always down-clock a laptop CPU from AMD.
However, this is the reason Microsoft is trying to stick to the 800$ price point for as long as it can. Cheaper options are more popular and they don't want most people to hear how 'crap' Windows 8 tablets are based on hardware anytime soon.