CC will likely never come back to MMO's.

People complain when they can't just mash their face over the keyboard and zerg through a game.

Should it come back?

If implemented well, yes. Since it adds an increased level of depth, thought and tactics to otherwise monotonous trash that don't do anything special because they all need to be mindless zerg friendly...

This would go beyond "Just Sleep mob X and then don't hit it" since that isn't really adding much other than frustration when Zergy McZergface comes and spams his AoE's and clips the sleeping dude and wakes them up. (Or if you follow Ye Olde WoWe style, Sheep one mob, Freezing Trap another, Hex a third, Repentence a fourth, Shackle/Banish/Hibernate/Bind a race specific fifth. With potential for ghetto hard CC from like Entangling Roots on a melee dude for a 6th CC. Also with the really old school Mind Control usage to not only lock down a dangerous target but also then use them for evil to help deal with the trash pack (Such as MCing a healer mob to push out insano healing, or MCing a mage dude who'll blow up the other trash better than actual Mage players))

But stuff like silencing healers to prevent them from healing/buffing their allies. Pacifying dangerous ability based enemies. Using Stuns effectively to mitigate damage. All alongside standard interrupts as well as various forms of soft CC to mitigate damage (Such as Slow, Blind, Knockbacks > Binds *Cough*Fluid Aura*Cough* or Heavy).

It's just... This would require for them to make trash actually dangerous and interesting. As well as add enough tools to jobs to allow them to actually accomplish this.

Also, likely would also require for trash to live longer so that there's actually merit to CCing rather than tossing a handful of Flares into a pack and having them all fall over.

With the final point being, to also make these things relevant for in boss fights too, so that you don't have a ton of vestigial skills that are only relevant for trash packs (Given that we seem to be limited to like 2-3 AoE skills, this seems like an actual concern for devs. Instead of you know... Making more encounters with AoE requirements to help justify more interesting AoE rotations)