I hope at least Thancred and Urianger (my favorite of the current Scions) quit their lives as Trusts before 7.0. It's never a good thing to keep characters around after their development and story arcs end.
And though I like Vrtra as a character I hope he doesn't succumb to the thirst for adventure idiocy and childishly sticks with that instead of focusing on his role as a leader of a nation. Assuming we finish this rescue arc before 7.0, he has no business staying in the party much longer.
I wish G'raha and Y'shtola would stay behind. But Y'shtola will probably stay a Trust forever, and G'raha just joined. So counting with Krile three of the spots are guaranteed with returning characters. This last patch gave me hope as much as the twins have their fans, they might actually find themselves busy with their own thing. I wouldn't have any problem with Alisaie staying, but Alphinaud's arc is also finished. Not only did he finish helping out carry on his grandfather's duty in saving Eorzea but also found his resolve and vocation.
Zero's development is going so fast I don't think anyone can say for sure she's not just a temporary ally for the current patch storyline, or if she will join the WoL indefinitely.
As predictable as the fakeouts in Ultima Thule and the power of friendship against Meteion?
Face it, if they opted to have Zodiark as the final boss, you would have just said something along the lines of "well of course, Zodiark was always going to be the final antagonist".
On another subject I'm surprised aveyond liked the SMN rework. Sure it fits the job fantasy better... But the gameplay execution is so mind-numbingly boring and repetitive even by XIV job design standards it was the worst experience I ever had in a MMORPG in 15 years. And I have never been so glad it shares level with scholar. Besides, that has not been how Summoning has worked in mainline Final Fantasy since 2001. It's interesting how the team handpicks what should be based on 90s Final Fantasy design and what shouldn't, even though those first 10 games were released more than 2 decades ago.