Would just like to point out that, even in the event of an Ascendant Hive's "true" death, their soul isn't completely destroyed. This is proven when we fill a crystal shard with some of Crota's soul on our quest to kill Oryx.
This means that, not only do Hive have a throne world to retreat to after regular death, they have an afterlife even after they die their "true" death there too. I hypothesise that, as the soul still exists, they could still be resurrected somehow.
I, for one, would like to see Oryx return at some point, he was the first villain that spoke our language (I mean, beyond the faint whispers from Crota in the story mission), and he was the first Raid Boss that had a proper buildup (not only was the story about killing him, but the post-story stuff that lead all the way to the raid was cool).
-
Nope, Oryx and Crota are dead. They were killed in their own throne worlds, unlike his sister's, who he killed in his throne world, not theirs. That is why he could resurrect them. As for Crota, we were stealing his essence. [quote]From this day forward, Auryx, you and your sisters will each survive death — so long as you aren’t killed in your own throne.[/quote] - worm gods [quote]If my echoes are killed, and I am killed in the material world, then I will be driven back to my throne the Dreadnaught. If my Court and my throne can be beaten, if I am confronted in my throne, if I am defeated there, then I will die. My work will end.[/quote] - Oryx Crota's soul was destroyed in the Wakening. His true self, will, and power was destroyed in Crota's End, as was his Oversoul. The same happened to Oryx in the Dreadnaught, which is his throne world and seat of power.