Wait.. you're serious? That's interesting.
I don't know why, but the name change depresses me... it's so insignificant.. but not symbolically. Symbolically, it's the end of Cass.
I've thought about this for awhile. Realistically, how much was Cassandra actually a Seeker at this point in her life? She was purely a Seeker for what, a few years?
Then she became the right hand of the Divine. I mean, she was still a Seeker to an extent, in so far as she had the powers, and I'm sure she communicated with the Seeker hierarchy and helped them in any way she could. But being the right hand probably meant she wasn't involved in the day-to-day business of the Seekers.
I don't think it was a coincidence she was the only Seeker to reject the split with the chantry. Sure, she's a very moral person, and that probably played a part. But you're not telling me every Seeker was amoral or immoral. It's just, at that point in her life, after almost 20 years of serving the chantry and the divine directly, she was more of a chantry representative with Seeker powers than a Seeker. Her viewpoint was no longer aligned with the Seekers but with Justinia/the Chantry.
I think the destruction of the Seekers will probably shake her, a bit, but more in the way that it will force her to confront something that's already happened, rather than as a drastic sea change in her mission and outlook.