Skeuomorphism or not, visual variety is useful: shape, texture and color cues that tell you instantly where you are and what you're doing, and trigger your habits for that particular app. Much more productive and easier to use than having everything look alike, as pleasingly minimalist as that can be on an artistic level. I'm happy to have GarageBand feel unique in one way and Calendar feel unique in another. Same reason the folders of papers in my cabinet are color-coded!
(Example: OS X's Finder sidebar icon like Home and Desktop that used to have colored sidebar icons. Now they're all the same blue-gray and you've lost a visual cue that made them quicker to find and click. Compare to the Go menu which still has the colors. "Like" them or not, those colors were useful!)
I don't think skeuomorphism is a problem... bad or useless skeuomorphism is! But so is bad or useless interface design of any kind. (Like relying on unique swipe commands with no visual cue to remind you how this app works.)
And one long-time classic skeuomorphic element makes good sense even with minimalist design: making buttons stand forward. In print, nothing is clickable and flat 2D design is great. On a device, some things are tappable/clickable/draggable--exactly like real-world controls--and giving them a little depth is a logical and useful convention. (Sorry, Windows Metro: I like the look and I'd hang it on my wall, but it has usability issues.)
So here's hoping for minimalist UIs... with clean, simple skeuomorphic elements where they're useful.