Google generates an astonishing $3 billion in free cash flow every quarter, and is growing at a rate of 20% yearly.

It still dominates search — the way most of us find information online, and the most lucrative form of advertising ever invented. It's got the dominant smartphone platform, Android, and the No. 1 video site by far, YouTube.

As one analyst put it recently, we've reached Peak Google.

But from that peak, there's only one direction: down.