My understanding of the federal government is that there is indeed a main door for the Roadmap, but the other doors shouldn't be closed either. We wouldn't want to go into a ghetto with one organization in particular and then lose our connections with the other departments. Industry Canada isn't there, but Industry Canada needs to play a coordination role in its sector. The same is true of Immigration Canada.
As for the Roadmap, Canadian Heritage, from what I understand of the Official Languages Act, is somewhat responsible for that. Now is it playing its role fully?