Cyber Warfare and the Mutually-Assured Destruction of Cyberspace

I frequently read the writings of Lenny Zeltser; he's a smart guy who always has something interesting to say.  He posted a short entry on his blog in July of 2012 stating his theory of how countries will use the principle of mutually-assured destruction to deter each other from a major world war in cyberspace.
Worth a read, check it out here:
http://blog.zeltser.com/post/27846821868/mutually-assured-destruction-in-cyberspace