The hardcore market is very small today. Thats what i was talking about. Look at the most hardcore sims and how few people are playing them. The simpler/simcade - not arcade - have more players, and the arcade racers has millions of players. The hardcore simmers who love realism, unforgivable, punishing if make mistakes, learning to setup their cars, do endurance racing etc is a small group compared to the Forza/GT/arcade masses.
From my experience that is changing a bit, people are getting more refined when it comes to "gaming" and the simulation world is growing very fast. Of course GAMES will allways sell millions because they're made for entertainment purposes only, kids or ignorants will allways fill that market (the majority), but there's something changing about those people that are in the middle. If you look for real motorsport fans aged above 30 for sure they're looking for realism more than ever...