The primary indicator of success is success. That is to say that the number one thing people look to as a predictor of future performance is past performance. In the product space, this means that things like adoption are important as much for what it signals to other people as they are for bottom line revenues. And this is true even in the open source world.
As SDN speeds its way towards mainstream adoption, this means that projects like OpenDaylight will need to establish early on that they are not only deployable but also deployed.
Source: Open Source