The sports talk format is really aimed at older white males. Sure, some of the hosts are African-americans or other minorities, but the aim of the programming is to go after older white males.
I'm saying this because Los Angeles is now a majority minority city with most of those minorities being Hispanic followed by Asian- and African-american people. The sports talk format, no matter where it's at, has never really attracted these listeners, and I really don't think that putting sports talk on FM is going to make any difference.
The one football team this audience liked (when it was in Los Angeles) was the Raiders. While the Rams drew in a lot of white fans, my late father (who was a Rams fan and never liked the Raiders) actually attended a Raiders game in the late 1990s as the result of getting a free ticket through friends. He told my mother after he returned to Phoenix that he was surprised by how many black, Hispanic, and Asian faces were in the Raiders crowd--he never saw those large numbers at Rams games back in the early 1970s before we moved to Phoenix.
But I digress. I just don't think that sports talk, no matter who has the format, is ever really going to be a big factor in the Los Angeles ratings of today--the demographics of the listeners it's aimed is not as big as they were years ago and the current demographics just aren't interested in sports talk stations.