For LACR and Carlsbad, they didn't own the land, and the owners wanted the land back.
For California Speedway, some dhead whined about the noise (it's in an industrial area next to busy train tracks), who had a great lawyer. Found some obsure law that indicated a piece of paper wasn't filed properly.
Nearest track is over 150 miles away. Second closest is in Las Vegas.
We used to spend a lot of time at the drags, but it's now something that becomes a 2 day affair instead of just Wednesday night, or Saturday.