I could imagine a "DoWnet"(omg, original) where online players could store their armies with all their equipment, battle gear, experience, replays and what not. Pretty much like any MMO's database. When joining a multiplayer game, players could decide whether they want to use their unique consistent army or a prefab one.
That, gentlemen, would be beyond awesome. Especially if there were unique loot online, like my WAAAGH decorating their Nobz with the heads of Nick's humies, or a squads being uniquely named after their losses, victories, etc. Persistent content that mattered.