I will never understand people railing against Rogue taking the cure as much as they did. I think it's because people lost out on "Miss Marvel Rogue", per the wishes of fans prior to the event.
The word is that Fox shot multiple endings and focus grouped Rogue taking the cure VS not taking it. Taking it won out.
The movie also showed that the cure is not permanent, essentially saying via metaphor that you cannot just cure yourself of what's different about you, so it's really kind of a moot point. The movie doesn't even send the message people imply that it does, as pointed out earlier, Angel chooses not to take it, and the movie essentially says "Decide for yourself, not based on what others want".