The Trojans still get lots of airtime on Mason and Ireland (the most popular sports talk radio show in LA) on ESPNLA 710, although that might partially have to do with the fact that ESPNLA 710 is the official home of the Trojans (and also the Rams). I haven't listened to Mason and Ireland in quite a while, but the impression I last got was that the Trojans and Rams were about on equal footing.
Trojans football is a very decorated program and will always have a large following, but its "staying power" isn't like Michigan, Georgia Tech, and Georgia. Note that I only listed programs located in and around large metro areas where college football is arguably on par with (or even more popular than) the NFL. And part of the Trojans' popularity is derived from their success in the mid-00s when LA didn't have a pro football team, let alone two.
Even with the Super Bowl victory, the Rams still need to make inroads. There are still lots of Angelenos who haven't completely forsaken the Raiders because of legacy; instead, they root for both teams. I think it'll take a generation for the Rams to fully entrench themselves back into the LA fabric, and this SB win certainly helps. I'm just glad the Rams are back in LA. They were the first pro sports franchise to be based (1946) and win a championship (1951) here.
And the idea that LA never really cared about or supported the Rams is/was rubbish. If you grew up here in the 50s, 60s, or 70s, the Rams were unequivocally LA's pro football team. Then they moved to Anaheim (away from their core fan base) in 1980 and stayed there for the next 15 years before packing up for STL. So the Rams are essentially two full generations removed from enjoying the privilege of being LA's true NFL team.

(
larger); Bring Back the Los Angeles Rams