If that's the case, alot of fanart, and fanfics are ganna come true. (Though, I'm sure they had this idea before all of that. I doubt they go around reading fanfics, but they seem familiar with the meme jokes.) I actually see some upset about the possibility of Twil'y someday becoming a "princess/alicorn." (Sense y'know, some fans consider all alicorns as "Mary-Sus," or something.)
Maybe she's preparing Twilight to fight the final boss someday in World 8-4. (Spoiler: The final boss is Mike Tyson.)
Come to think of it, didn't one episode ("It's About Time" I think where Twilight was scared of the future, perhaps a subtle joke on the "2012 appocalypse" fear-mongering) say Ponyville was close to Tataurus where alot of bad creatures have been imprisoned? Scary thought there.
Well if done poorly then they could be, like it "My little Unicorn" where that guy was stronger then Celestia and Luna and had three horns and Celestia was in love with him and turned over the kingdom to him, that is a "Mary-Su" is I ever so one and I usaly hate that word.
Ha! Then he turns in to Sephiroth with the "One winged Angel".