Agreed. The Google Ad Machine will never stop running. But, I think they will diversify their revenue streams in the coming years. Forces outside of Google's control such as governments and competition will begin to push back on the "all you can eat buffet" of personal data that Google has enjoyed in the past years.

Based on the numbers in the article like doubling their "large business" user base in the past year, I think Diane Greene will lead them to generating huge revenue in the Enterprise sector. Also, I think freemium versions of Google software, directed at consumers, will be increasingly popular in the future.