Seriously, as a designer myself I can only shake my head when I read stuff like this.
It may be true that "traditional visual metaphors no longer translate to modern users", but what about older users? Should we just dismiss their needs? Are interfaces really encumbered because they feature a wood-textured background?
Also, I challenge you to come up with a symbol for saving files without using a diskette or something like that. These symbols have transpired from metaphors of real objects to metaphors of actions, and people who have never even seen a diskette learn their purpose by context. Granted, this creates a certain standard by convention, and you could argue that any symbol could be used for that. But again, that would dismiss the users who grew up with that symbol. Currently, everybody is happy, why challenge this?
Imho, articles like this and blogs like skeu.it are just cleverly-disguised marketing by Microsoft. Ask any designer, and they'll tell you that well-used skeuomorphisms are not problematic, but even necessary to reach most of your target audience.