When this all ends I expect people to become hardcore traditionalists with social experimentation becoming incredibly taboo for centuries.
A world where Men work hard, Women stay at the stove and help raise the children, and everyone is Christian? Yes, please!
I'm more predicting a world where men form fraternities, secretly shag each other and young boys, women are paraded around to show off how "Manly" their husbands are, and the elders and bishops are about as Christian as the pharisees were Jews. I don't see a return to traditionalism so much as an embrace of reactionism and superstition. At best we'll be embracing traditions with the fractured myths and legends as our foundation for tradition while missing the important cultural and historical context behind it and more importantly why those traditions failed in the first place to the point of allowing experimentation to rise in the first place. The Idea that life used to be a utopia, and the only reason it ended was people got bored and greedy." is a foolish statement at best. Every failure and mistake in human history has led us to this moment, and I'd rather not have to repeat another 6000 years of human evolution. Which if things utterly implode, is exactly what I will predict will happen.
They're insane not even feudal societies put whole continents on gibsmedats.
You can't do that to a species without causing its extinction.
Ah but that's the thing immortal. They have a child's view of what ruling is. They view being king or emperor as the ultimate golden parachute they think it means they will have all of the food drugs, and consorts they want (Both adult and children) and will never have responsibility or want for anything again AND having the prestige of godhood on top of that. They don't think about the responsibilities that come with the system or the weaknesses and cracks that caused said systems to fail in the first place.
The world right now is in the hands of adult children who have never known what it's like to work a blue collar or even a mid-level white collar job. They don't know where food comes from or how the software is maintained, they've never had to utter the words "Thank you for calling tech support, how may I help you today?" they don't know how to produce. They only know how to collect and redistribute.
The great cause of mankind's calamity is not some devil or shadowy cult of devil worshipers. (Though I'm sure Satan is more than happy to take advantage of the chaos) but our own ignorance to think we have an idea of a perfect universal idea of heaven (despite the fact that earth's population in the billions and counting) and the arrogance to think we have the right either given by God or our own hubris to enforce that vision of heaven on everyone else.
in many ways, that's even scarier than a devil or illuminati.