The immediate implications of the Rams’ victory are primarily on the fanbase of Los Angeles and on the pocketbook of the Spanos family.
While the Chargers have a small core fan base that is unshakeable (you perhaps?), the move to Los Angeles was done to increase that fan base via LA natives. The Rams making the Super Bowl is likely only going to convert uncommitted Angelenos into Rams fans that could otherwise be swayed to become fans of this rising Chargers team.
A smaller fanbase will quickly decrease the profits for the Spanos family. We have already seen the team struggle to sell seat licenses, an early indication of local fan support.