So FS Investors a group of stock brokers from Orange County (that included a former President of Qualcomm and a major player among the ownership of the Padres) showed up about 5 minutes after the Chargers left town, and said in so many words, "Hey, we know you guys are sad, and we wouldn't dare think that we'll be replacing the Chargers, but we think SD had a tremendous Soccer culture, and Qualcomm Stadium is looking pretty old. We'd like to submit an expansion bid behalf to bring an MLS franchise to San Diego."
Their original plan was to lobby the City Council to pass the "Soccer City" proposal. When people old boys club started mobilizing, people starting bitching, and City Councilpeople started making comments that made it seem like they weren't going to rubber stamp it.
FS came out and said that out of respect for the sentiment they were detecting, they would prefer to give the people a voice via the democratic process rather than lobbying for the proposal to be passed out of Council, and asked to have the public initiative voted on though a special election last year. The Mayor also had a proposal related to addressing homelessness he asked to be voted on as well. The City Council denied funding for a special election.
One point I forgot to mention above was that built into the Soccer City proposal was an assurance that if San Diego was not granted an MLS franchise, ownership of the Mission Valley site would be returned to the city.
So after that City Council block, SDSU issued a clone of Soccer City called SDSU West, without the self-funding, or built-in oversight that would assure things would get done on a timely schedule, or that the City wouldn't get hosed, and that's not even getting into the scumbags pushing it and their history in SD.
And the last year went by, and SD voted for SDSU West last night. So now they have a promise that the city will sell Mission Valley to SDSU at an undefined price so something can be built there some day.