I actually disagree with this first paragraph, I think Sony was right. The "race to the bottom" definitely did impact the industry, and for quite some time, no manufacturer even offered a laptop with decent build quality, except for Apple of course. People thought "why should I pay $1,000+ for this laptop when I can get a much cheaper laptop that will do everything I need?" And then the Macbook Air and the iPad come along and all of a sudden, people have no problem paying more for a quality product. If it wasn't for Apple, the OEMs would continue to release shitty machines until they all went bankrupt from negative profit margins.
I don't think the tablet market is experiencing the same race to the bottom because people are not buying these shitty tablets (which the Nexus 7 isn't). Everybody is still buying iPads and will continue to do so until a tablet that can actually compete with the iPad is released. (I have only seen two that even come close, the Galaxy and the Transformer, and still...) I think Apple has proven that consumers are willing to pay more if the product is good. And this is all coming from someone that does not own a single Apple product.