Create a new feature called something like "Card Caps"
-- Put a limited amount of cards in a game...
A. Map capacity (number of regions on a map)
B. Limited amount (100,200,300)
At a certain point in the game, the cards run out... (basically making the game a no spoils game)
It would certainly change the ebb and flow of the game...
Benefits:
Create a new exciting kind of game
Could potentially end all the stalemates in trench games