There are many factors that contribute to a network’s success – but one of them will always be the quality of it’s blogs. You can have a wonderfully branded network with great PR but it’ll never go anywhere unless it has substance at it’s heart.
I expect there to be a rush by business opportunists to harness the power of legal and professional service businesses’ blogs through the power of RSS. The key though will be the quality of the content and the value add to the end user and the syndicated bloggers. This will require a blend of strong content, sound technology and network features.