If you don't want a screen to articulate, it can always latch back into the body where you can attach a protector and leave it there. I always thought the swivel screen was a gimmick... until I used it. I now find myself saying "If I had that swivel screen I could get all the way down/up/against to get this shot." It would be awesome for stills and video. As for durability, they would likely make the mount for a camera like the 7D out of metal, or something much stronger than the glorified laptop hinge on the 60D.But it wouldn't be awesome for stills, would it? Because in order to use it, you'd have to fall back on "Live View" mode, with its attendant autofocus issues.
The idea is that you make up for not focusing as fast by at least knowing -what- you're focusing on! You don't have to use it all the time, of course... When you do, you don't even have to fold it out. For stills, though, it is mainly useful for those shots where you wouldn't be getting the shot at all without it, or would have a lot of trouble doing so.