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no..
Was on the Grand Ballon (in France) with a friend, his rear derailleur failed thanks to a wire that got damaged.. Swapped some wires within in the system, and he continued as normal.
I had a rear wheel come of my bike (horrible Zipp QR malfunctioned, yes the model that was recalled) and landed on my rear derailleur. This would normally snap the cable on mechanical models, in my case just the rear derailleur stopped working (front was still fine). Then just unplugged the battery and plugged it back in and all was working again.
So no, Di2 malfunctions hardly ever mean nothing works and if one of the wires becomes damaged you can easily swap it with one of the other wires, without having to do any adjusting or tensioning afterwards.. And you can also bring a spare wire, or even a junction box or battery. Since they are tiny..
If all of the above fails, you can always just push di2 derailleurs into the gears you like. They'll stay there quite happy, no weird cable rigging needed.
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Jaap
I have to concur with him, it is actually easy to jerry rigged a cabled drivetrain than it is a Di2 one.
When something go wrong with Di2, it usually required having to hook it up to a computer, run diagnostic, find out what the cause is, could be derailleur, could be cable not pushing into the junction box, could even be a glitch, this isn't uncommon.
We don't have laptop with us when we go touring, just spare cables.