If they can't fix the AOE, they need to redo the upkeep system to be more like vCOHs - Wehrmacht had lower upkeep than the US did, which meant slowly the rifle spam advantage turned into a US disdvantage late game (without supply yard upgrades). This would let Ostheer players lose a unit or two to the one-shot one-squad effects that are all over the game and still compete.
Yeh and why don't they change the resource system too whilst they're at it... Don't forget Wehr had bought vet so this made up considerably for squad wipes.
Personally I think they are a little too cost effective at the moment but this is massively dependant upon the map. Maps with shot blockers and cut offs spring to mind as it's just too easy to get pushed off the map as Ostheer