Perg,
I don't know many baptists who adhere to a truly connectional ecclesiology. As I read the history, the "independence of the local church" has been of paramount importance. Baptists in England saw themselves as a form of Congregationalism, and were asserting their identity and prerogatives against a centralizing CoE and impositions of organization.
Some Baptist denominations are more "denominational" than others. There is no "THE" Southern Baptist Church, but many "A" Southern Baptist Church, because the idea of a "church" stops at the door of a local gathering, and only takes form again in heaven, where the invisible becomes visible.
I don't think "connectionalism" really fits the sort of fellowship you are describing. Perhaps one can create new terms for certain cooperative arrangements: like "association"? You might have a board of representatives that is "advisory" at best, generally existing to facilitate cooperation.
The notion of connectionalism seems to me to include the idea of authority and government. The various bodies you describe are what they are because they aren't connectional. Appealing to the mystical connection (union) we all have to Christ as the head of all Christians, leaving each organization and body as a discrete governing entity hasn't changed anything from that which we already understood. If you call it "connectionalism", then a word with one older meaning has been appropriated to now describe the opposite thing from that for which it was coined.
Regarding implications, maybe you could reformulate the question.