It may be a generalization to say that they're not into space exploration, but they seem to be less interested in seeing it in their fiction. Oddly, I'd wager that sci-fi as a whole is stronger than it was back in Trek's hey-day. Many of the top shows on TV (the horrible anomaly of American Idol
aside) have a sci-fi bent.
Here's hoping Trek XI can reverse that trend of shying away from space shows. Sadly, it won't have happened nearly soon enough to save Firefly.