Just don't make multiplayer so important that the game loses it's solo player fizz. This is what Triumph did to AOW:SM it is so multiplayer oriented the AI is pitiful and the solo game both campaign and random suks royally. The only players left for that game on the forum are the multiplayers as they ruined the game so much for all the solo players. The community made mods (they call them patches haha) are so multiplayer oriented it's sickening 1.04 and soon 1.05 all geared toward what the multiplayers want on Gamespy.
Personally I could care less if you make a multiplayer addition or element to the game or not. The only one I would ever be interested in playing would be hotseat. I liked, no in fact I LOVED the way you LEFT IT OUT in GC and GC2 and applaud you for it. You could leave it out in this game and I'd be just as happy an elated.
Multiplayer games seem to draw away from the solo fun of the game because of whinners about BALANCE in the multiplayer aspects. Then as developers try to stop the crying of the whinners about BALANCE they ruin the solo playing game. You can't win and there's only 2% of the people out there that actually play everything multiplayer anyways. There's been polls after polls to prove that solo content is the MAIN reason players buy games. So, keep that in mind when the multiplayers start crying for BALANCE.
The other great aspect about MOM is it wasn't balanced for multiplayer because it didn't have a multiplayer feature. At least that way solo players could have challenging games playing a lesser race over the more powerful ones. Gnolls come to mind here. MOM is the greatest fantasy turn based game made so far. If you want that title for this one then you better take a hard look at what MOM offered and made it the best over the rest.