New ideas for these two concepts have been added in the following places:
Nodes/Conecpts->Concepts->Old Nodes
Nodes/Conecpts->Concepts->Node Connectors
They cover the basics of what happens to old nodes, how they and their connecting community are handled, along with the creation and removal of connecting nodes. Please join the discussion in the comments and help us refine these ideas and also pointing out established concepts that we may have neglected to add.