Yes, like Ellie Weisel (author of Night) said in his acceptance speech "if we forget, we are guilty; we are accomplices". What he meant by that great phrase has a lot to do with the thread: All that is put in writing, whether it is for entertaining, for inspiration, for information, or for plain criticism still inspire us to place ourselves in the situation, and examine who we are and what role we occupy in the greater scheme of things.
I agree with the response in #2. All these authors are telling us, the readers, to be aware and alert to the signals in these books. When we pay attention to our surroundings and the dealings of big corporations, governments, etc., we can counteract in order to prevent the sort of futures portrayed in these books. It is the same with books like Night and other Holocaust memoirs--in order to prevent the bad things in history from being repeated, we must be knowledgeable of the events and pledge to act against repeat performances.
I hope you are asking this from a philosphical point of view rather than a pessimistic one. Writers like Bradbury, Huxley, Orwell, and even Lois Lowry (The Giver) sometimes paint a bleak picture, but they are doing so to get the reader to think. The fact that you have read "Farenheit 451" and are thinking in this manner gives us hope that, "no"- we will not end up this way. We recognize the symptoms and we have the author's message.
Truly, the author must be thinking that a bleak possibility exists. In pointing out the direction a society or character might be headed, we can avoid the pitfalls that awaited them.