I was thinking further on the subject of expansions. I used to play Star Fleet Battles and they had a module come out every year or so.
What if WotC published a small rule book with some cardboard chits called “Facilities and terrain.” It would be say an expansion pack (to any A&A game) that could include the following: 1) research facilities; 2) Sub-Pens; 3) defensive zones (eg. Maginot line); 4) Rough terrain; 5) Seasons; 6) Characters.
Charge enough to break even + 10%. Just an idea.