Well, let's be realistic -- a change to the role and responsibilities of a Local or Regional Coordinator would fall under the rubric of a 'campaign rule', so it would make sense that those roles would only change at the season-breaks, as well as being considerate of the volunteers' time that you'd give them ample warning that changes are coming down the pipe so that, if it turns out the changes are more than they can deal with, they have the chance to withdraw from their roles. A "change in how communication happens" likely involves a clarification on who should be responsible for communicating what information when, and that may very well mean a change in roles or responsibilities.
If I were to make one specific recommendation it'd be to have some sort of published record detailing what an Adventurers League player, DM, or store organizer can expect from Local Coordinators, Regional Coordinators, and WotC staff -- for example, "a store organizer can expect that a Local Coordinator will visit the store roughly once or twice a year depending on the size of the local region, and will be able to explain how to connect to additional resources to incorporate D&D Expeditions into your store activities, give you contact information for local conventions in your area, and provide rules resources for the current Adventurers League storyline season".
These expectations don't have to be exhaustive -- like the game rules themselves, they can't possibly cover every possible situation -- but they should cover the baseline expectations that a player, DM, or store organizer might have with respect to the AL campaign staff (where 'staff' includes both the volunteer staff and the WotC team).
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Pauper