I heard on Rich Eisen's show that there is real enthusiasm in the NFL for Item #1 in Joe's quote. Entertainment complexes are apparently the next big revenue driver, in addition to owning the overall stadium revenue and hosting other events. If the Chargers move with them, the stadium would need to be scaled back since Spano's pockets aren't as deep.
Weirdly, that factor might help smaller franchises get help to stay in their current cities. I wonder how long that will last.