They'll simply subscribe to the new updates of Adblock, automatically install the latest version in a sandbox and determine which ads are being blocked. Then they automatically rearrange the urls, css or content in the page so that they are no longer blocked. Within minutes of the new release it's been neutered. Failing that an engineer is automatically alerted to look into it via the ticket system.
And what's to stop Adblock from doing exactly the same? The amount of resources. If Adblock starts blocking actually useful content on the page, people will just stop using it.
Oops, I should've patented that instead!