Not to nitpick but..
1. The switching cost from Google Search is certainly not zero, it implies switching from Google, which is virtually impossible because it's tied to Chrome, YouTube, Android and Gmail
2. I don't know many people who are dedicated "Pepsi" fans, they just grab whatever drink is available Coke/Pepsi..
3. I've also not heard many people who are never willing to switch from "Crest".. People will just grab the next available option if Crest is not on shelf. No one is pre-ordering Crest.