No, that's Granny Weatherwax!
I dare say you are right that many people are scared of the natural world, but it can't be the sole reason most folk don't want to return to 3000BC. (or even 1900AD).
In my own case, my misspent yoof was spent in a tent in places like British Columbia, Scotland, Iceland , New Zealand and the like- not true wilderness, but places where you needed to keep your wits about you , know your gear, your abilities and not screw up. But even that "20th century Spartan" existence relied on decent maps, a good tent, cosy sleeping bag and so on. I was on holiday. I was (mostly) dry, warm & comfy. I was , admittedly, occasionally hanging off cliffs by my fingers, toes and elbows (never a stylish climber, me)- but drop me in the same places with a stone axe and no shoes and how would I have fared?
Well, probably I'd have survived, because I'm sneaky and vicious when hungry, but it would not have been much fun -either for me, or the creatures I killed and the people I stole from. And that's the bottom line. This world can't support 7 billion humans on a hunter gatherer economy.
The first thing to go, after the bad bits of civilisation- the big pharmas and power companies and governments- would be the good bits of civilisation; equal rights for women and the disabled, tolerance, cooperation, science, hot baths.
No. Count me out thanks.
Which is not to say we couldn't do with less. We could.
Less people, for a start.