Yes, of course they do, the alternative milk market is growing fast but most people still go for cow milk if they want milk. That's why grocery stores still devote a ton of space to cow milk.
https://en.wikipedia.org/wiki/List_of_countries_by_milk_cons...
I still don't drink the stuff, but it's only dawned on me in the last year that there are other reasons, such as environmental concerns or ... actually, I'm not sure. Opening two tabs to Google "oat milk why" and "oat milk why site:reddit.com" now, which conveniently makes this relevant to TFA :)