If Bradbury were to write a similar book today, what additional menaces might be warn against that have become evidence since book was written?

There are relevances in todays society with the book. Much like the novel, we are in an age of disposable emotion, disposable items and disposable relationships. If people are dissatisfied with whatever they have, including relationships, it is easier to find something new than work with what you had. Instead of reading books of substance, many people prefer to text, play video games, or watch mind numbing tv shows. Of course we have not reached the dystopian levels of the book but I think we are heading that way.