[danenania]

"Search, which provides the majority of Google's revenue, is precarious because there are very low costs for someone to switch to another service."

Google's dominance in search has nothing to do with customer switching costs. They are dominant because, imperfections and privacy issues aside, they legitimately have the best performing search engine on the market. They are able to retain this position because search is an extremely difficult and resource intensive technical problem (like mapping), that nobody has been able to credibly challenge them on since they took over.

If someone builds a better search engine than google, then yes, their position will be precarious, regardless of the other ways they've roped people in. But none of the current crop of competitors give any reason to believe this is imminent.