You lost me at, “San Diego was a football town.”
The Chargers seemed to have plenty of support in SD, but I live in Florida, and will take your word for it.
SD had a long tradition of the CSUSD Aztecs since the late 60s. That was winning tradition. The chargers had strong teams on and off. for the size i would say it was a good football town. I went to 9 Aztec games in the early 70s when Dennis Shaw was throwing 7 touchdown passes in a game and thew stadium was filled. It was called AirCoryell.