This is how I see it.....
Google wants to keep the user on Google. Google is looking at niches and aggregating the information and then calling it Google knowledge. Think about that. "Google Knowledge". Google has no knowledge beyond scrapping web sites and building massive data centers. Google knowledge is actually "YOUR KNOWLEDGE".
Right now there is a symbiotic relationship. We produce the content and allow Google to scrap it so that we get Google to send the visitor on to us so that we might make some coin from the visitor in one way or another.
If Google keeps those visitors to itself, where then is the symbiotic relationship that has built Google to what it is today?
Will webmasters start to block google as some big news organisations have?
I think that is coming pretty soon. Maybe not next year or the year after but it is coming. Web masters are falling out of love with Google as Google is biting the hand that feeds it.