If not in caves, they'd rather we live in the sort of hovels you might find in an African village...perhaps a hut made of cinder blocks, with simple mats tossed on a dirt floor for bedding.
The Left would be quite content if we reduced our lifespans by 20 years; it would solve all of their perceived problems: climate change, health care, general sustainability, and so on.
There is a 60 second laser treatment to cure leftism. A 100 watt invisible wavelength laser beam pointed into their eyes (from a safe distance of say 500 yards) will render them permanently unable to envy what you have. They can't envy their neighbors much if they cannot see the new boat and SUV in the driveway.