Apple's "thin, thin, thin" innovation trajectory was always going to end in tears.
People have been questioning this obsession for years, especially at the expense of battery life and other key features. The iPhone Air is a perfect example of how that obsession eventually creates untenable compromises that even the most loyal fans and early adopters can't abide.
All that said… I find it interesting that the MacBook Airs are NOT "thin, thin, thin" anymore, but instead are just feature-stripped versions of the Pros.