I can't even count the number of people I know with surround systems on one finger. It's simply not a thing.
I expect this varies a lot based on who you know and where you live. I live in a relatively expensive, relatively large US city. I own a single-family home in an older residential neighborhood of the city. I don't have room for a surround system, though I do have three stereo systems I've cobbled together, none of which have optimal speaker placements. Most of the people I know are in the same situation, space-wise. I think many have stereos, some may have less-than-optical home theater setups. Most probably have some sort of bluetooth or smart speaker the earbuds that come with their phones, or an inexpensive replacement. AirPods seem pretty popular, too. My brother, on the other hand, lives in a suburb. He has a room set up with a HD projector and basic 15yo surround sound system. His neighbors probably have similar or more expensive setups.
Most people are going to be introduced to music in Atmos on EarPods (and eventually some new cars) before deciding whether to go to the trouble of trying to get it on an existing home theater setup. What I've heard so far using headphones isn't make a strong case for going beyond that.