I agree that IRC isn't responsible for a lack of growth, but I do agree that Discord is far more popular and user-friendly, and that it could help growth a little.
Realistically MG has a good deal of competition and in most aspects just can't compete.
It has a very out-dated engine(AI being an especially sore point), and very out-dated graphics, meaning it also has limited gameplay scope(AI mostly, and lack of engine-side support for many desirable gameplay features), and just doesn't look appealing next to most other strategy games.
If you guys want to continue this side of the discussion it might be good to split the topics, if not, whatever.