It depends.
There are people (not mentioning any names) who play LFS only and just for the sake of racing. People in this group aren't really that interested in the hardcore realism of LFS, as they might just use some old arcadey steering wheels (or mice/joysticks and what not) and even custom/chase cameras to gain that little bit of advantage in their races. This group of people can accept the LFS development pace just fine as is, as they don't really care about anything else but the racing aspect. They recycle the available content over and over, without getting tired of it. They find the racing part most exciting, the realism is just a fun side effect.
The other group of people, I think are in it for the car simulation enthusiasm. This group isn't all that dedicated for just that pure racing sensation, but more of trying to feel the car and the physics around it while trying to drive as close as possible as in real life. Racing is still important for this group, but they aren't interested in maximizing their racing efficiency with unrealistic cameras and clutch macros. I think this group will also get bored of LFS much sooner than the "racing is all that matters" -group as they depend more on the content and less on how high standings they get in their races. Variety of cars and tracks is the key for this group. They find the realism most fun, good racing is just the side effect.
It all boils down to which option each group finds more fun personally.