It's worth noting that was a turning point: the "more wood behind fewer arrows" policy adopted by Larry [1] initiated the die-off cycle of Google products. Prior to that, as far as I am aware, they were much more tolerant of products staying around in a mature-but-not-wildly-successful state. Afterwards, it seemed as if they would only keep things that maintained a trajectory to become as successful as their core products.

Again, this was not entirely unpredictable. While I don't remember the details of that lecture, I remember the professor calling out these sorts of big shifts in cultural values as being typical of startups transforming into large companies. And Larry himself was part of the transformation, turning into (presumably, what he believed to be) what was needed to lead Google into its next stage as a large company.

[1]: https://googleblog.blogspot.com/2011/07/more-wood-behind-few...