There are many vulnerable, yet civilization-crippling targets, out there - that can all be played out in the secret wars theatre - at least until the curtain is finally drawn.
Secrecy is the problem - never benefits normal people - always ends up as corruption.

Sea-cable severing by merchant ships is a classic example of how far you can push the secret war without actual shooting.

Apart from internet/electricity, water is another big, vulnerable one. I guess if you shut off electricity, you shut off water, but it could also be disabled with a targeted computer hack (or a few well-placed explosives at key dams). How's Taipei (or anywhere) gonna go for a week without water? What happens to all those daily shits?

Hard to see that happening on a global level using the 'those in power have too much to lose' theory, but like Dan's limited nuclear war scenario, all of the above could get a theatre-release somewhere, Taiwan maybe.

On another note, as drones/cyberwarfare will feature heavily in any future war, in terms of training soldiers, you're gonna need at least as many computer nerds as traditional soldiers. I wonder if that's reflected in the current training.