Eh, depends on if we go out with a bang or a whimper. I'm betting it's going to be the latter.
If not, then it's likely that nukes put a stop to the artilleryfest before it has a chance to really get going. And my point about there being a lot of roads in the world still stands. No military would start to target roads in any meaningful scale when they're going to save their precious shells for the enemy.