I honestly think that they should consider this for multiple disciplens going forward.
I know there is bad blood and bad history between SMS and Sector3/SimBin, so I hate using the example, but RaceRoom has shown that this model can work.
With the core infrastructre that SMS is putting in place with Project CARS 2, there isn't much left to enhance or add in the core engine. Sure, there will be the expected bug fixes and incremental enhancements, but there isn't much left in the form of "revolutionary" enhancements. At least not with current hardware technology.
This model could provide 4 - 5 years of steady revenue for them before focusing on Project CARS 3.