Not entirely true. San Diego would love to have an NFL team, they just didnāt want to foot the bill for it. Measure C, the initiative before San Diego voters in 2016, was dead on arrival because back then, it required a 2/3 supermajority to pass since it involved new taxes being implemented. 2 years later, the California Supreme Court struck that down and said a simple majority is all that was needed. Sadly, the Chargers had already decided to move to LA. A subsequent ballot initiative may have been successful since the Measure C tally was very close to passing if a simple majority is all that was needed.
NFL football is still very popular down here in San Diego, but the betrayal by the Chargers and Dean Spanos for relocating, to LA of all places, runs deep. Most people here would welcome a new NFL team, just not the Chargers owned by Dean Spanos.