It would be a good idea to namepace each of the DKAN modules on drupal.org for the following reasons:
Each module can essentially be an advertisement for the specific feature set of DKAN that the module fulfills. The documentation would point to getdkan.
2.. It prevents anyone from creating a module with the same name and creating confusion in DKAN's name.
Wouldn't be a bad idea for Drupal commit credit which could encourage more contribution... though could be a pain to actively maintain the codebase in multiple places.
Having the modules show up as Drupal people are searching for solutions to a single problem could lead them to DKAN to solve it more comprehensively.
It would be a good idea to namepace each of the DKAN modules on drupal.org for the following reasons: