This will doom the company. The thinner laptops are worthless overpriced netbooks. Why pay so much money when you can have the same functionality with a $150 netbook?
Already android phones and tablets are driving Apple out of the market, and once they lose the PC market, the company will probably fold up by 2013-14 at the latest.
The 15" MacBook Pro is a very bulky, heavy laptop. I had been hoping they would slim it down, improve the form-factor, and decrease some of the chunky aluminum and bezel space around the display. It could really be a much sleeker laptop, and even better with a retina display and SSD standard as well as Ivy Bridge.
A sleek and stylish, more portable laptop can still be svelte and uber-cool, and nothing like a netbook, providing substantially more features, functionality, and performance.
I think this is what Apple has in mind for the new MacBook Pros, decreasing the "dead space" and excess aluminum that makes it a bit hefty, ditching HD in favor of thin blade SSDs which are super-fast, and adding retina displays which make them in a league of their own....plus providing desktop-level performance with hi-end Ivy Bridge processors.