this is only v1
Anyone who has followed Apple over the years knows that this pattern is to be expected. Version 1 of a new product line will be sold at high price to a few early adopters. It will have problems, to be sure, but the point is Apple is dipping their toe into a new area. Don't forget, there will be dozens of later versions which address the problems and lower the prices.
Look at the iPod. It started as a $400 clunky, monochrome, 5GB brick. So many pundits claimed it would never sell, that it was overpriced and underpowered. Sounds familiar?
The complainers will always complain because they can't think outside the box. Version 2 will be better and cheaper. Version 3 better still and cheaper still. Eventually, everyone will be talking about the MBA's descendant as the must-have subnotebook.
Apple's in this for the long haul. Don't forget that.