Other than messing with it occasionally (not for some time now) I don't play RoR. However, as far as I can tell, it has a fair sized community of people that are really into the multiplayer and roleplaying in it. I think in time if/when BeamNG Drive has lots of content and multiplayer, it could pull a lot of RoR users, especially because it will certainly be more polished. BUT, , RoR is free so that's a big factor. I can see this taking people away from RoR, but it will take quite some time.