You can blame it on this for not being picked back up...
http://en.wikipedia.org/wiki/FlashForward_(season_1)
Look at the amount of viewers and how they drastically declined mid season.
Then compare it to this...
http://en.wikipedia.org/wiki/Dancing...U.S._season_10)
20 million viewers vs 5 million....
Big shocker which they're gonna choose to continue.