I'd say a rounded rectangle isn't narrow at all.
Consider one of the examples given, the XBOX. The XBOX design patent found here [1] contains far more in the way of specific, distinguishing features than the rounded rectangle [2] Apple is claiming.
Microsoft would have to be awarded a design patent for a "roughly square electronic housing" to equal the absurdity.
1: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sec...
2: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sec...