I completely understand your point about the Angels being in one of the top tier markets in the USA, and thus it's unlikely they would leave SoCal. Maybe go to Long Beach or Irvine or something.
But never say never. Just ask all those Sonics fans up in Seattle who lost their decades-old team to... Oklahoma City?!?
Seattle Metro = 4.1 Million people, $97,000 Median Household Income
Oklahoma City Metro = 1.5 Million people, $56,000 Median Household Income
Angel Stadium is one of the oldest in the league. Despite good maintenance and thoughtful updates in the last 25 years, it's decrepit. It weakens the ability for the team's new owner to stay in Anaheim. Thus, you open yourself up to some hungry and well funded groups in other Sunbelt cities who could steal the team from SoCal.
I would just caution all of us to think that the Angels will always be in SoCal, let alone always be in Anaheim. This is going to get interesting, that's for sure!