With search, we already approaching that point.

No other search engine comes close to the quality of Google, at least for certain topics.

Outside of Russia, China, Japan and some other countries Google is the dominant search with a big lead.

And that is troubling indeed! Competition is good. And necessary for a healthy market.

It also means that Google has a huge amount of control over what information can be discovered.

What if MS decides Bing isn't worth their while anymore in 5 years? Yahoo will have dwindled away by then, leaving only Google. In Europe, Google has +90% everywhere (except Russia).