I would say the spurs left for the same reason the Pistons left the silverdome, no nba team wants to play in a place with a ceiling that high and temporary bleachers half way around the court. Their fans deserve to have a proper stadium set up.
The Alamo bowl does well also because they take a pac 12 team and a big 12 team so they are close enough, but also because San Antonio is fun, its not like a bowl in Birmingham or El passo.
The one constant through all the years, Ray, has been baseball. America has rolled by like an army of steamrollers. It has been erased like a blackboard, rebuilt and erased again. But baseball has marked the time.