People will use google to research and search things... Further, the search engine itself isn't where it needs to deliver ads. It's gathering data on you to figure out what you want and need in that moment, and if it's something to buy, they will use this data to optimally find exactly the most perfect product you are seeking. If anything this level of depth and AI will improve their ad delivery across the web.

You're acting like Google wont know how to adapt and instead just sit around complaining that their old model and way of doing things doesn't work.