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This is the best reply. I'm not sure why anyone would want to bury the skirt any deeper than necessary. You could just lay it on the ground and let grass/weeds grow up through it.
But that to me is the real question: how deep is necessary? What I've read is that when digging critters hit an underground barrier, they just tend to try digging deeper. So you've got to imagine at which point a predator will give up digging. I would expect that is not a constant, but differs according to the individual predator, its experience, how hungry it is, how motivated it is (young to feed), etc. All those variables make me feel nervous about the buried wire approach.
For us, it was a nonissue for another reason: we have heavy, clay soil. I hate even to have to dig a hole to plant something.