Google ultimately generates revenue from people using their engine and ad server to find things. If the quality thereof goes down, you will see people flow out

Google ultimately generates revenue from people using their engine and ad server to find things. If the quality thereof goes down, you will see people flow out of Google. If you say, no, that won't happen, remember people have to flow into Google in the first place... it's not the default search engine for the majority of installs...