What fascinating times we live in. My interpretation of the general history of warfare is that countries agree on restraint once some situation has occurred that all sides agree should never happen again. Mustard gas in WWI, nuclear weapons in WWII... Hopefully this doesn't spiral out of control. It's not clear where the boundaries are that we don't want to cross.
I'd be pretty happy if governments all decided "cyberwarfare" was an acceptable substitute for the real thing. Nobody dies, some money is lost, some important people are embarrassed.
In short, critical infrastructure all over the world is being needlessly put at risk. The operators are placing their own knives across their own throats, and all a network-based attacker would need to do is jog a few elbows.
A few people might die. It's not like anybody is putting kill-bots out there, connected to the Internet, with an easily-toggled BERSERK_RAMPAGE flag (yet), but I think water treatment plants and electrical power grids are probably vulnerable to attack, and could cause some folks at the margins to die.