In a former life I was a board member of the Erasmus Student Network, this network like several other student networks (AIESEC, ELSA, etc.) had a hub and spokes model: 1 international association and a long list of local groups.
In this scenario the international association has a set of rules about the criteria a local group has to fulfill in order to be recognized as part of the network. Typically approved associations in turn are than listed on the central website and gain other benefits (in a lot of cases they can vote at some sort of annual general meeting). The central association also helps establish new local groups.
Would it be desirable to start organizing the different Drupal Associations into a hub and spokes network?