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Electronic derailleurs will have to come WAY down in price before I'd consider it for an MTB. I've only worn out a few road derailleurs in the past few decades, but I've gone through many MTB derailleurs. Here in New England, it's too easy to get sticks and branches caught in the spokes and/or drivetrain, resulting in the derailleur getting ripped off the frame (usually destroying the derailleur, and often taking the hanger with it). And if the derailleur does manage to remain intact for some time, the grit and grime around hear wears out the pivots much faster than road riding does.
In other words, rear derailleurs are nearly disposable items around here, so I'm not willing to pay a lot for them.
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