What's the setting? I mean, I'd think a pretty good segment of NA drinkers are people who still want to retain a bar-like social circle without getting shitfaced, the latter part being a pretty big caveat.
Also, I'll add that the discovery of non-shitty tasting NA beers is a pretty big deal to people who have been drinking for years and whose impression of NA beer is "the O'Doul's shit". I for one am elated to find viable NA beers. And not just viable, but good. I really only jumped on this train to help the Missus quit, but am finding it great that I can drink as much as I want, (theoretically) whenever I want, and not worry about how many I have or the way I feel next day. I am getting the same psychological effect drinking one of these at the end of the day as I get when I grabbed the real deal. I am also beyond the age where I feel I need it to socialize or sing karaoke or something like that.
That's certainly not going to be the case for everybody. I'm fortunate in that I enjoy alcohol more than I'm a slave to it. But there are a lot of folks out there in the same boat as me (and may not realize it), and I hope they try the NA thing not because I'm a teetotaler, but because of the improved quality of life and probable extension of it.