I don't use Google much, so I am not sure what you mean by this. Can you elaborate on what makes switching to another search engine ridiculous?
I might be unaware of what I am missing. Web searches are a pretty low-frequency, low-importance action for me. Thinking now of what I use search engines for, I suspect many of my searches are simply to confirm the domain name of a site I am vaguely familiar with, and any search engine can do that. For me, Amazon's dominion in online sales (something I use routinely) is more ominous than Google's dominion over search and advertising (something that I use so rarely).
Google could disappear tomorrow and I would scarcely notice.
That said, the reason I rarely use Google services is because I don't trust them and don't like their business model. So while I agree conceptually with the notion that we need to encourage alternatives, I disagree with the method to reach that end. I don't think exercise of government power is correct; I feel exercise of consumer choice is more appropriate. As a Netscape/Mozilla user in the late 90s, I felt the same way about Microsoft, and ultimately feel the government's suppression of Microsoft hurt the industry in several ways that are difficult to quantify.