Or they are perfect for those people that do actual work in an actual infrastructure that is properly shared, protected, etc... None of my media is on my MBA. I would have a 2 TB drive in there and it would still be empty. My music collection is on a NAS, with all my documents, on proper mirrored storage, backed up and accessible on all my devices simultaneously with no syncing required.
Frankly, the only thing holding me back is the fact that you're getting a 1440x900 screen essentially. I'd still rather get the "old" MBP with 1650x1080 hi-res option. At least that gives us usable pixels. Sharper text is nice and all (the retina display on my 4S is amazing to look at), but I'd still rather just have the raw pixels to work with and 220 PPI is just too high, while Apple's 110 PPI 1440x900 is atrocious.
Laptops should have minimum 130 PPI with around 160 PPI being ideal. This gives the best compromise between usable pixels and text visibility.