This may seem to be complicated, and indeed it is. However, there have been more complicated things (i.e. Dwarf Fortress, particle physics), so it's a matter of finding a very dedicated team, and funding might be taken care of with indiegogo or Kickstarter. This would best be taken care of by something similar to Dwarf Fortress (i.e. develop it an indefinite amount of time but let people play what you've worked on so far).
Edit:Basically, a game that covers the overall war itself. A game in which your numbers play an important role in the role, but do not determine the results.
By the way, the setting doesn't have to be modern.
Oh, and to clarify, my thoughts while reading the book were "These would make a very fun and strategical game", not something like "Games should be more realistic". I'm just exploring ways in which realism could add fun and strategy as well as tactics.