You in Greenville?
I agree with you. I do think NBA fandom is generational in home markets, but it's only there, which contributes to its regionalism. Sacramento loves the Kings, generations of fans. Same with LA and the Lakers, Boston and the Celtics, etc...
The Hornets been around awhile and still don't have no following like that. They aren't that relevant in the city or the state and I think that's a contrast to NFL where no team is truly irrelevant...
But I think the NBA probably always been this way...