There is more true about what you said than I can sum up with words, but we should never forget original thought. Thinking of new innovations is something we must all strive for, and we can never forget that. Sure we may end up looking a bit foolish more than once in a while, but trial and error is what life is all about. If we don't try to forge ahead with new innovations and ideas, then future generations will suffer for our lack of attempt.
Though, to quote a wise man, can't remember who he is right now. "There is nothing more amusing, than a young man who has thought of an old idea, and believes it's his own."