While some may take the update to mean that Karak Dum is much less likely to be tainted by chaos, consider the following:
You are a Runemaster of Karak Dum, already considered radical by your "fellows" in the greater Karaz Ankor, for the sacrifices and discoveries made in the name of fighting off Chaos. From what you've seen, Chaos will be beginning a big push in a handfull of decades. You arrive at the Runesmith Guild meeting, and make your case for the Greater Karaz Ankor to begin preparing for what is to come.
They refuse to listen, instead focusing on foolish things, petty rivalries and greed. It is clear to you that you cannot rely on them to help you. Karak Dum will have to stand alone against the forces of Oblivion, like Grimnir the once did. Like he still does as far as you believe. And you of all dwarves know how powerful belief is.
Chaos comes, engulfing the lands around the hold, potentially the entire world. It does not matter, Karak Dum may stand alone, but it stands tall, it stands strong thanks to your efforts. And as the years of siege continue, supplies slowly dwindling, warriors falling with no one to take their place, the Dawi of Karak Dum make sure that every centimeter lost is paid by the Enemy in an ocean of blood. Sadly, it is something they can afford to pay in the end. Even still, you are willing to go farther from tradition in the name of the survival of yourself and what could potentially be the last dawi on Mallus.
In such a desperate situation, what might you do in the name of protecting your people? When you are abandoned by those that stuck to tradition, how far will you go in the name of survival? The fire dwarves in the east faced this same question, they made their choice. What about you? You may have lines you think you'll never cross now, but can you say the same after decades of constant demonic incursions? What about centuries? When a quarter of the dawi in the hold are dead? Or half? Or only a quater are still alive?
I am not sure what we'll find in Karak Dum, but I know that any survivors will be ones who've had to make tough decisions in the name of survival, Runemaster or not.
I mean all that was true before except we thought they had taken up apparition binding, consensual runic necromancy or something. The fact that the core of the issue is other runesmiths slandering them to make themselves look better means the starting position of such a potential fall isn't already halfway down the slippery slope.