She is justly fantastic!



And seriously I think that Daybreaker has the potential to become the most fearsome and machiavellus villain of the show for the mane six and the princess. Besides there are tw possibilties to make her not just a "nightmare" of Starlight Glimmer if not a real threat:



a) If the Tantabus was almost able to run away from the "Dream Land" and become real why not could Daybreaker thriump where he couldn´t and become a real pony?



b) The question of the timelines created by the "Timeline Chaos"caused by Starlight Glimmer, for me it's perfectly possible that a Daybreaker from another dimension try to invade the main one.