Except it's not. Remember how everyone switched to Altavista in 1996 because it was so much better? Remember how Yahoo took over in 1999 because it was so much better? Remember how people switched to Google in 2003 because it was so much better?
History shows people actually do switch search engines when there's a better one. And they do so quickly. I mean, look at how quickly people adopted ChatGPT for some of the things they used to do with Google!
They're not switching away from Google now for regular serach simply because there isn't a better one for most people.
You have zero evidence for claiming it's because they're "used to Google". People didn't stay with Altavista or Yahoo because they were "used to them". So why would that be any different for Google? The answer it that it's not.