It looks like the open web is having a sort of renaissance in certain segments of the web. You can read some articles from John Gruber, Dave Winer, and Joe Cieplinski.
The term open web is amorphous and means many things to many different people, so trying to nail down a single definition and meaning is akin to nailing Jello to a wall so I’m not going to try to do it.
However, I will throw my hate in the ring and state that I have similar questions about where the web is headed and the continued increase in influence the largest of companies. Google, Facebook, Amazon, and others do not seem willing to concede control to users and this worries me.