When we consider any new features or changes for Steam, our primary goal is to make customers happy. We measure that happiness by how well we are able to connect customers with great content. We've come to realize that in order to serve this goal we needed to move away from a small group of people here at Valve trying to predict which games would appeal to vastly different groups of customers.
Thus, over Steam's 13-year history, we have gradually moved from a tightly curated store to a more direct distribution model. In the coming months, we are planning to take the next step in this process by removing the largest remaining obstacle to having a direct path, Greenlight. Our goal is to provide developers and publishers with a more direct publishing path and ultimately connect gamers with even more great content.
This is a big step for Steam, and will make it incredibly trivial for developers and publishers alike to publish games on Steam.