I can't help but think who/what is going to pay/feed the training data for all this innovation.
As a content creator, this feels like the bottom in the race to the bottom. Google was already keeping users on their site as long as possible (e.g. snippets), this will only worsen the bounce ratio from content creators like local news sites & niche blogs (worse ad performance, less sign-ups) who fuel traffic. It also feels like an extinction event for sites like StackOverlflow and Quora, gamification to get users to write 'free' content will die-off if Google keeps front-running sites like this.
I feel Google will eventually need to go into the content creation/syndication business to keep all this going (and pay up vs. Google News), because the incentives for everyone else are just not there, if they want to keep everyone on Google.