I think it's almost impossible to create so many content for single player using only one developer
And even if I can create such game it will be the game for the single run.
That's why I decided develop some kind of sandbox game. Where you can use different tactics and different opponents each time.
Maybe we can consider some dynamic campaign. But it also will require huge content.
I understand, that content ist quite a time related problem. So this game can be compared to something like unreal tournament. Quick multiplayer games, with no story ?
If so, will it be possible to play against the AI? Or will there be an AI at all? This would be a good compromise.