IMHO the problem with the current OS X design is not the lack of skeuomorphism but the lack of discoverability. Many controls are hidden unless you hover over them, and there's no indication of where the active hover areas are. You just have to know, or get lucky. Buttons are often indistinguishable from plain text. Editable text is often (perhaps even usually) indistinguishable from non-editable text. Useful information is often obscured behind fancy graphics. Visual effects are included simply because the technology exists, not because it actually adds any value. What is the point of being able to see a blurry image of what is underneath a drop-down menu?