There are a few faulty assumptions here:
1. That the elasticity of demand is the same for every market. As you noted, the Rays have a pretty inelastic market ... winning doesn't really impact how fans treat the product. The Red Sox and Cubs ALSO have a pretty inelastic market for the opposite reasons. Opposing stars help things along, but how much really?
2. The actual Anaheim Angels are 13th in attendance. So having two elite players hasn't been a panacea. Last year, the Phillies had one of the biggest stars in the sport AND won the pennant ... but were 16th in attendance.
3. LA, San Diego and Philadelphia all have pretty serious ex ante dreams of winning it all. Nothing that has happened so far should dim their fan bases view on those team's contention. The ex ante assumptions on the Red Sox are kinda bearish and is shows.