How long would Humans last without their golden child? Would they be able to recover from such a death.
closed as primarily opinion-based by Chenmunka, Aegon, DJClayworth, BMWurm, recognizer Sep 1 '16 at 16:36
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It's impossible to give you an actual time because there is no way to know. It's been a long time since I looked at the source material, but there are at least two broad answers: Very quickly, and Not at all.
The main canon would suggest that without the Emperor, the astropaths would quickly get whacked by daemons and navigators lose their protection/beacon. Total shutdown of all interstellar comms and travel would make the job of guarding humanity on the physical front nigh impossible. Further, you'd no longer be transporting all the minor packers to Earth do feed the god-corpse, which would exponentially increase the number of potential possession vectors. It might take a while for the last vestiges of humanity to get eaten by , but it wouldn't be long on the galactic timetable.
I do recall some stories in the older books (I want to say Realms of Chaos, the originals), that suggested that keeping the Emperor trapped on the Golden Throne was actually preventing him from being reborn better, harder, faster, stronger, and so it would be better to unplug him. I don't have a reference for that as my RoC books were lost years ago.