I've only had a trike for about a month (a used Sun EZ 3 SX). I'm constantly being stopped by strangers who ask "where did you get that." The other day I was towing my two grandchildren in the bike trailer when a car with a young couple pulled up and wanted to know every thing I could tell them about trikes, which wasn't very much.
I think lots of people will try trikes when they learn about them. Some will not because of tradition or image.
I had a similar experience when I switched from a tent to a camping hammock for backpacking.