Oh yeah, there's no way this isn't coming back in X-Factor in one for form or another. Because I don't think we'll be seeing David going this route.
I'll do a reread later, but my first take is that the Crucible is a means of control. As mentioned, if even a significant fraction of depowered mutants decided to simply suicide as means of getting their powers back, it creates a logistical issue for the resurrection queue (which makes me wonder if there hasn't already been an issue with that). Wrapping it up in rules and ceremony and making it a thing you have to "earn" puts a bottleneck on that.
Overall, I loved this. Sam kinda broke my heart a little - just got his little brother back, then he has to watch his sister commit suicide by Apocalypse. Even knowing she'd be coming back, that had to be pure hell. Annnnd I'm chair dancing just a bit at that Warlock sighting.