I'm just going to debate just because. That game against the Steelers was bad in term of ratings, but let us be real, everyone probably thought the Chargers was going to win the game.
During my time living in L.A., my experiences as a sports watcher or goer is that if it is worth going or seeing, we will watch. If we know that the L.A. team had to do was step on the court/field, we didn't watch. I remember a lot of us having that attitude during the early 2000s Lakers and the USC dominance because it was too boring.
The Chargers game was competing against another game which was the Yankees Astros game 2 and that game probably explain the San Diego viewers because 1. There are Steeler fans in San Diego too. 2. There are probably more New Yorkers, Yankee fans, or whatever Yankee related that reside in L.A/Orange County than San Diego. However, when it comes to ratings ( I know it is the Packers), it was the most watch game that week and the game had a higher rating than the Packers Chiefs on Sunday Night football (if I am reading this correctly).
With the opposing team taking over the stadium. The stadium is on a CSU campus and it is only a couple of miles west of Compton. From experience, even before an NFL team arrived, that university had issues when it came to parking security for students or people attending events and the streets and parking were pathetic. With that being said, a lot of people probably don't go to the games because of the horrible experience with the University, the streets next to the University, or that it is too close to a certain city.
I think Inglewood will be better as they have revamped that area and by seeing that events are happening and selling out in the Forum again, I think football fans will attend the stadium.