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I can't help but like the electric fence idea. I wonder what the weight of the thing is?

  From UDAPS website:


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Have a good night’s sleep while sleeping in bear country. It is perfect for backpacking due to its size and weight. Bear Shock® only weighs 3.1 lbs. without batteries and 3.7 lbs. with batteries, and fits in a small 5" x 20" storage bag. Bear Shock® will enclose a 27 ft. x 27 ft. area, and runs on 2 D-cell batteries that can supply power to the energizer continuously for approximately five weeks.

Roughly 4 lbs, split between 2 hikers isn't that big of deal.
Like pfd's/ comprehensive first aid kits/ SPOT devices etc, it's all about your personal comfort level.
I've always had the mindset of being ready for the worst but expecting the best.
So far it's served me well.

There are plenty of ways to get seriously injured/die on a wilderness trip.
Getting eaten by a bear or mauled and left for dead would be #1 on my list of bad ways to go. :'(