The one point to consider is that you can't use the Nic we've seen so far to predict how he will act in the future.
Consider that Nic now is in a much different place. His secret of how the noose can be used against him is out. Anduriel's power has been revealed, and with it, a way to counter one of Nic's biggest advantages. Nic's following has never seen him take it on the chin like that in their lives. Setbacks, yes, but not to that degree. Nic's standing among the supernatural set has taken a huge hit. He no longer has a favor he can call in from Mab. His two biggest Denarian supporters are either dead (Deirdre) or now bitterly opposed to him (Tessa). He has trespassed into the Vault of Hades and could conceivably be on Hades' list of People To Do Bad Things To.
Old Nic had his secrets intact, his followers (mortal and Denarian), his Marker with Mab, and his reputation. New Nic has none of that. He's going to be different now. How he is different, remains to be seen. He could become reckless, fearful, overly cautious, etc. It'll be interesting to see if/how Jim decides to shape Nic going forward.
These are good points. I thought when Nick torqued off the Archive he was toast, particularly when you consider that his minions needed to write things down constantly to 'chat'.
I doubt any intelligent person interacting with him would think Nick had a 'reputation'. He was a Fallen.
I am not sure that Tessa is fully against her husband. After all, she stood next to him after Deidre died at Michael's house. Plus they aren't necessarily totally in the driver's seat. The Fallen have a say in Nic and Tessa's choices.
BUT...Nick now has the Grail. That has to mean something. That he wanted MORE was never in doubt. What he got was bad enough.