I was sitting about thinking of what would make me want to play MR some more, and this fantasy land popped up.
Imagine a map the size and detail of, say, Ghost Recon: Wildlands or FryCry, which had a few starting points to choose from. You'd spawn into a garage, and you'd explore the map 32+ other players. You could play logging or good old 4x4 exploration. You wouldn't need to find friends on forums to play, you could just join up and find others to tag along with as you explore maps. You would run across other players as your drove around. Also, realistic weather conditions would be a cool addition. Some realistic rain showers would add some more realism and challenges.
I haven't the slightest idea of if it is even possible, but games like Assetto Corsa or Arma have huge servers and maps, I just think it would be cool to integrate something similar for this, even if it is a mod. Understandably it would take countless hours and difficult to do, and thus would never likely happen, but I think it would open the game up immensely.