The Australian government has a DNS changer check page - http://dns-ok.gov.au/ - to help you determine if you are affected. With the impending shutdown of the DNS changer servers, some are estimating 30,000 - 40,000 devices will be affected - really a drop in the ocean of the millions and millions (billions?) of devices connected to the internet. 

I figure some people will find their internet isn't working, shrug their shoulders as they assume it's another 'computer gremlin' and get someone to help fix it. No Cyber-Armageddon of Internet Doomsday.....