Well, maybe, but I still would say no after all. Such expansion would need to have included serious limitation on the use of nuclear and other mass slaughter weapons to make it playable and fun. But considering, that the modern warfare is all about the asymetric wars, you are loosing all the fun in it (I mean it is not challenging at all = not fun). So to make it enjoyable, you would need to make it a simulation of a global war. But if you make it a global war, you also need to include a massive usage of nuclear weapons. And this makes it NOT fun again.
Can you see that vicious circle in it?