The Lakers have been lacking a true superstar since Kobe left so Lebron will help them generate hype, sell loads of merchandise, and sell out every game.
I do agree that Lebron moving to LA ha something to do with Hollywood. But it doesn't mean that he will not bring his best to Lakers. Remember he singlehandedly bring Cavs against the Warriors so don't be surprise if the bring the same attitude in LA to compete in the West with the likes of GSW and Houston.
At least lebron can play in a relaxed manner. He doesn't have the same pressure anymore because of his age and he has already won 3 rings. Most experts already rank lebron in the top 3 greatest players of all time. So from here on out anything else he accomplishes is just icing on the cake.