Barry Schwartz for Search Engine Land re: Google killing Instant Search:
Now as you type, you will only see search suggestions and then be able to click on those suggestions to see the results. The search results will not load any result pages without clicking on a search suggestion or clicking enter.
As I said previously, end of an era. Pretty much everything good that Mayer brought to Google they are shooting in the head. This isn’t to say these aren’t the right decisions for Google, but they’ve certainly moved on from her approach to things – which made them the #1 search engine in the world.