The article is weird in that Google has the single greatest advantage - YouTube. Ctrl + F youtube and ... nothing.
TV ad revenue is going to start changing, but the value of video ads is massive. Google has not just YouTube, but the best video advertising platform for others to use.
If 15% of the US$70B on TV ads moves to YouTube, Google's growth should be sustainable. Multiply that by not just by the USA but Europe, Japan and Asia, and Google's growth looks fine.
If Google reaches the point they can buy the NBA TV rights for YouTube, heck, start small and buy the TV rights for a major Australian sporting league as a test run, or perhaps a single college conference like the ACC, and lets see how that article ages.