If that happens I'll be glad to have swapped out Cassandra for Leliana as my Divine choice. I can't have anything bad happening to Cass.
You know?
I'd honestly find it fitting if the Backer for the assassination plot was a surviving Knight Vigilant or Senior Enchanter who got sort of peeved with the Inquisition for allowing their faction to either die at Haven or become corrupted monstrosities.
Their minions would obviously be backed by the portions of the Chantry that dislike the Inquisition basically having the influence to actually put a candidate on the sunburst throne.
I can picture it now.
The Grand Cathedral has a procession entering it; The future Divine approaches the center altar and throne, she kneels before the cleric who produces a crown.
Suddenly a single figure breaks from the procession, then another and another, their chantry robes fall away revealing full plate armor.
The sword of mercy emblazoned upon the chest piece, they draw their swords.
The handful of Inquisition soldiers throughout the chamber are handily killed.
The future Divine turns to see the commotion.
The cleric leans forward and a knife and seen, a momentary glimmer in the light.