My prediction for Hollywood in another 20 years is:
Sean Penn will end up owning all of the movie studios, making him the richest man in the world. Then, he persuades Lex Luthor to fire missiles into the San Andreas Fault, separating California from the U.S. mainland. He then purchases it, dubbing it "Happy Happy Joy Joy Penn Land".
His first order will be to demolish the Hollywood sign and replace it with a Barack Obama statue. There will be hundreds of global warming movies, where Al Gore narrates everyyyy singleeee oneeee. Rambo sequels will be replaced with P.E.T.A. action movies, but the Russians will still be the villains.....WWIII will start shortly after.