I didn't think I'd say this, but I'm actually looking forward to electric/electronic shifting.

At least if all its potential is unleashed.

1. Position sensing.
Some form of sensor determines where the sprocket is, and micromoves the derailer to the optimal position after every shift. Goes for both front and rear. No more rub - ever!

2. Automatic calibration.
The inner/outer limits and sprocket positions are automatically recorded and set during a setup calibration cycle that can be initiated in a setup mode. Just keep the chain moving at a minimum speed until the setup signals that it's done. Very practical if you often switch between different rear wheels.

3. Friction-like manual mode.
Not really necessary if #1 works fine, but could perhaps be useful. Small dial on the tip of the hood could let you microshift the derailers laterally, without actually doing any full shift.

4. Special!
There's also the potential for a "linear" shifting mode, where it will shift up and down through all usable gearing combinations, in sequence. No longer any need for the cyclist to keep track of specific shifting patterns - the shifting system takes care of it all for you, provided it's been told how many teeth the front and rear sprockets have. Just click UP or DOWN (or something like that) and you'll get your next harder or next easier gear. It could also be possible to program the shifting sequences manually, complete with front derailer first/second order determination.

If the battery can be made to work in really cold temps, it would mean that frozen shifter cables is a thing of the past.