But conservative Hollywood kept trying with one Julie Andrews musical after another and more big budget historical epics ("Battle of the Bulge", "Tora, Tora, Tora", although they struck gold with "Patton"). Poor Darryl Zanuck couldn't make a star out of his squeeze Irina Demick or dig himself out of "Cleopatra". Was there a Broadway musical they left unfilmed ? The Right lost control of Hollywood because they lost their audience with the collapse of the family market.
I wonder though, whether the moralistic Irwin Allen disaster movie was a continuation of the Biblical epic. Didn't they all have a "Jeremiah" scene where the prophet pleads with them to follow him to the truth but the crowd angrily refuses (like when they wouldn't climb the Christmas tree out of the ballroom) and is smitten for their sin ?
Ironically those 70s diaster movies were the last refuge for old Hollywood stars. Hey look it's Helen Hayes! It's Ernest Borgnine!
They lost the family market when they switched from following the Hays code and went to the letter-based rating system.