Yeah, I could see Dash possibly joining The Wonderbolts in the very last ever ever episode. Along with this though I would like to see how the other Mane 5 turn out, possibly spread out across the last 7 episodes. Each episode would have an achievement for one of the Mane 6.
Twilight could possibly reach her full magical potential and be like all epic and stuff. She would have some sort of role in ruling Equestria with Celestia and Luna, due to her name being Twilight, which is the time between Day and Night.
Rarity would become an international designer and make it in the big leagues. Maybe her and Spike have a romantic moment as well, who knows?
Fluttershy would be the owner of her very own Zoo which Zecora might help her run. The Cutie Mark Crusaders might find a Cutie Mark here for one of them. And the other two throughout the last episodes.
Applejack would develop Sweet Apple Acres to a point where the whole pony universe knows how good it is, resulting in a lot of money for the farm due to many visitors buying Apples. Fixing Granny Smith's old body, the barn and better equipment for the farm. Big Mac and Cherliee might also have a romantic moment, who knows?
And of course, Pinkie Pie would throw a badass Party at the very end. Vinyl Scratch and Octavia would play an epic Violin Dubstep beat at this party with Doctor Whooves and Derpy randomly appearing out of a Large Blue Box resembling The Tardis from Doctor Who.
All of Ponyville would give Celestia one last friendship letter and Spike would blow it out a window. As the camera follows the smoke up in the air finally we see The Wonderbolts with Rainbow Dash zoom off across the sky with "My Little Pony: Friendship is Magic" appearing just before the Credits.