The scions are fine, Thancred was great this expansion and the twins and urianger are always enjoyable.
It would be nice for one of Y'shtola's many "deaths" to stick, but that's less because I dislike her and more because the plotarmor is pretty clear. It's practically a running gag at this point.
I also wouldn't mind if they'd play for keeps more with major characters. Some important deaths of characters who aren't just relevant for one expansion would be nice. But I'm okay with the Scions.

Hell, this is the first time they've all been in focus together since ARR. Usually we only get focus on one at a time.