The news that Marvel Entertainment is cutting 8% of its workforce is the latest warning siren in Hollywood. After all, if superheroes can’t keep their jobs, how will ordinary people? It’s a serious problem in an industry where “below-the-line” workers — the crew, office staff, caterers, drivers — are the backbone of the local economy . California’s high costs, taxes and regulations have driven studios to leave — just like other businesses are doing. Hollywood unions, too, have played a negative