I want to say there was another reference, somewhere, to someone leaving their name in 'the Scripture that would follow'.  I think there are a few places where we get references to future historians having some knowledge of the Ordeal, which implies to me that Serwa is alive and successfully teleports some people away.

I think, absent Kellhus, his lieutenants and descendants can still reign in the Ordeal enough to keep it on track.

Sorweel kills Kellhus, Serwa kills Sorweel.  All else is as cannon.  I don't think Serwa can kill Kelmomas, since he will be the No-God, but she doesn't have to.  Story can proceed if she inherits Kellhus's destraction, doesn't have time for little child.

Battle opens as per cannon, with Ordeal overcoming the walls.

When the Fisherman strikes down Serwa, the Ordeal no longer has Kellhus to teleport up, meaning he snipes mages with impunity.  The big question now is whether Serwa, while under fire, can manage a teleport to get up there and kill the Fisherman.

I tend to think she can.  She pulls this off, kills the Fisherman, is killed by Aurang, who takes up the Spear.  The Ordeal is driven forth from Golgotterath and massacred by the backup Horde's arrival.  Kelmomas is seized by skin spies and born to the Sarcophagus, and Resumption.

Only major impacts are that one of the Mutilated does not die, nor does Aurang.  There is also no escape for Akka and his family.  A much darker timeline.

Kind of.  It spoiled the motivations of the Consult, which had hitherto been much less clear.  It let me anticipate the Inverse Fire being used as a trap for Kellhus.

I liked it.  TUC is my favorite in the series.

I tend to agree that there was more to Thelliopa than met the eye.  Definitely felt for her going out like that.

Finally read this story.  Very strange. 

@ThoughtsOfThelli:

Yeah, he would've been protected, but I think that protection was him deciding not to go in, rather than everything missing him.  It is certainly possible.  Like you say, no way to know.