The Saints staying in SA is not going to happen. LA needs a team first. Plus, the Saints haven't been happy having to move out of the Alamodome for previously scheduled events.
A ballpark would have to be built for the team to move to SA. Who is gonna pay for that? The Alamodome, sold to citizens as a multisport (baseball/football) stadium, isn't. I rather wonder how the city will react to the thought of a MLB team.
Interesting though.