St Louis officials are toying with the idea of building a new stadium—for professional soccer. They’ve pretty much admitted that a new NFL franchise is just beyond them. They built the TWA/Jones Dome on spec, hoping to lure an NFL team. They got the Rams, had a few good years and then started to slide. Unfortunately for StL, the lease agreement allowed the Rams to void the lease if the Dome wasn’t in the top 20% of league stadiums. More and more luxury skyboxes, etc. etc. St Louis and Missouri taxpayers (like SD taxpayers) finally said “Enough!”. That didn’t stop the politicians from trying to get around voters’ will, but the effort failed and the Rams left.
I don’t think St Louis misses the Rams as much as SD will miss the Chargers. SD was a football town with Charger emblems everywhere you look, whereas StL is a baseball town.