We are being set up for season 7. We just got the season finale next week I think left when inevitably, Starlight Glimmer, takes over in season 7. Twilight will be called away to important friendship business in a neighboring empire. Everyone knows she's being prepped for another major fandom shattering change. It has been so long since the last one. So Starlight Glimmer will be the new star, with Spike.
Oh... and then Spitfire has a flashback and burns down a tavern...
Bless you, Vapor Trail.