As the web matures, I suspect better inter-service compatibility is necessary, and this potentially sets the stage for that. I'm optimistic for the future this lays the groundwork for, but am cautious with regards to this project specifically, simply due to the names involved; hopefully more FOSS leaders will become involved, or this version will become superseded by a later framework, as I do not trust the current members to design with sufficient privacy safeguards.
On a side note, this will likely continue the trend of increasing the barrier to entry for more of the internet, hurting startups. Though that's dependant on how the framework is designed.