To be honest, it's not the CONTENT user mods that turned Assetto Corsa into the most successful PC game (although the content played a large part too!) but it's things like Sol, and numerous mods that added weather, physics tweaks and FFB changes, improved AI, plus stuff like two way traffic and free roam modes.
Given how poor SMS's record is for even fixing basic code issues, let alone adding new driving and racing modes, the PC version is going to be a totally different game from the console (just like AC1).
Ian Bell should have a mechanism for incorporating PC gameplay mods into the console version (perhaps a disclaimer that gameplay mods become public domain and can freely be used for the console version with no recompense for the writer).