It is nice, however, when it's an option at a bar and you can have something kind of like a beer, while not incurring the usual "What, just a water?" conversations.
Which is probably why people don't ask questions when you do it.
It's also hard to grow that niche. If 20% of people in the bar are ordering NA beer, it would seem to reduce the pressure to be drinking beer at all, or perhaps going to the bar at all.
If we time traveled to the future and you saw 90% of patrons drinking NA beer at the bar, you'd think it was a historical reenactment.
Also, our entire market economy is based on constant upward inflation/growth, and rewards those who grow faster.
They still make a small to medium sized fortune =^)
I like bars and hanging out in them, and it would be awesome to preserve the atmosphere with less and less alcohol consumed.