There is one thing i would absolutely love to see in a future Wargame, and that is the modelling of combat hierarchy. Instead of controlling single squads or tanks, the smallest controllable unit would be a company (made up of multiple platoons). Platoons within individual companies would be controlled by AI 'officers'.
It is baffling how few games attempt to model real world army hierarchy, even war games. The only games i know that do this are
Command Ops: Battles from the Bulge, and maybe Hearts of iron 3.
If the next Wargame would have this, i would by it, no matter the setting.
Since it would change the gameplay quite a bit, i doubt we will see something like this, but i can dream.