Earlier quoted context omitted.
You could estimate it from sales or something, but Walmart has a huge wall full of various TVs, and barely one half of one aisle-side of soundbars, and no receivers/speaker setups. I suspect something like 80% of people use the TV, and of those who upgrade, use a soundbar, maybe. And even those with a dedicated theatre room, probably have other TVs that are just TV audio.
That's a really sad percentage of people listening to such subpar sound that they might as well not be. I understand not everyone can afford nice audio, but a soundbar is such a drastic improvement, VHS=>DVD level of improvement, while a soundbar to surround is a DVD=>BluRay improvement. It's great for those with discerning taste, but not noticed by the vast majority. Granted, I'm not an audiophile, but I've been in/…
My soundbar can connect a second wireless subwoofer as well as a rear speaker set, and the setup process is extremely easy, which is one of the major hurdles with Hi-Fi equipment.