Free-flowing particles? Oh, that would be awesome, never even thought of that.
See the clouds stream around the canopy, a vehicle plowing through a cloud of smoke making it swirl around... that would be bloody brilliant.
Wouldn't hold my breath though. Think most of the progress in the future will focus more on physics, particularly procedural damage to vehicles and structures. Shooting a wall and being able to peek inside through the bullethole, or using explosives to blow a hole in a wall, that sort off stuff.