Or we could have recruit figures increase by factor 10. Instead of drafting, say 50 men, you'd now draft 500, so the longer a war drags on, the bigger the strain on the population. Units would also get 10x bigger, but I don't see that as a problem if the cost stays the same. This would also make battles appear much bigger. I've always found it a bit silly that an army of 3,000 men is one of the hugest in the game...
