Should Literature give in to Political Correctness

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One of my favourite books is by Agatha Christie, called "10 Little N*****s", which was written in the 1939 about a number of people who were marooned on an island,(N****r Island) and died one by one, until all were dead. The name of the book was changed to "10 Little Indians" (which some people still thought was deemening) and also called "And Then There Was None" The book itself is based on a Victorian music hall show song written by Frank Green in 1869. The Book has been filmed and been on stage many times under all three names. However what I want to know is should names of books be changed because of Political Correctness, when the book itself was written at a time before such a thing existed, and even though it could cause offence now, it probably didn't at the time it was written? Also words and their meanings also evolve, another set of books which I enjoyed reading were written by Berkley Gray about someone called Norman Conquest Known in most of the books as "The Gay Desperado", which had nothing to do with homosexuality, but would this even be allowed these days. (Its only a few weeks ago that a schoolchild in the U.K. sent an e-mail to a friend calling him "Gay" [but meaning something along the lines of wicked], because the meaning of this word has changed again resulting in 4 policemen turning up at his house to arrest him for this.