As a captain whose vessel is about to crash on the rocks empties its souls of doubt, so are the hesitant useful for throwing off of an enterprise nearing its end: blame must be cast in failure, profits divided easily in success.
I shall not waste any of our brief time together flattering your ego, as others have done before, with all this nonsense about skills and talents that do not help, or worse, that you do not actually possess
The way to be irreplaceable is to become a social innovator. Start projects that motivate you to save the world and simultaneously make you money (and create mindshare) for your company. Social innovation makes magic happen.