New Words... Dream On

I recently read an article on what to do about the singular use of "their" as a gender neutral pronoun. One proposed correction of this, is to create a gender neutral pronoun that can be used instead of saying "their" or "he or she." The one flaw in this idea is that there is no way that a new pronoun could ever catch on. Some people may begin using it, but no one will know that they are talking about, so they will eventually abandon it and return to something that they and everyone else already knows and uses. I found a cartoon that shows how difficult it can be to create new words and to get them to stick and become part of the language that everyone knows and understands. If people are still holding on to their older swear words, how do people expect a new pronoun to ever catch on?