To play devil's advocate; King is writing Batman, not Nightwing. From his perspective, what he does has to impact Bruce's narrative, not Dick's. Putting Bruce through the pain and guilt and whatever else of having Dick injured is a perfectly viable narrative tool.
Of course, that said, it's a viable tool for your supporting characters. It shouldn't be a viable tool for a character that is the star of his own title. Which just brings us back to what we always come back to and all of us know; DC's current management view Dick as nothing more than an attache of the Bat titles. Dick's not a star, he's a supporting character who happens to have his own book. As far as the people in charge are concerned, that's all Nightwing is; another Robin to use however they want as long as it fuels Bruce's story.
.....I am assuming there's been some kind of fallout in King's Batman. I trade wait that (and am currently at least one trade behind, because Im in no rush here) so Im just assuming that King injured Dick so Bruce could brood about it. There has been brooding or something right?
We know. But since DC won't treat the character better all we have are our own ideas we can bounce off each other.
I hold out hope that the next person they put in some kind of authority position, be it Batman group editor, or CCO, or EiC, or whatever, has not only more love for Nightwing but enough gods damn business sense to recognize the IP's value and build on it.