Get real. Most of the people actually riding trikes are older guys (like me) with some health problem (broken hip, stroke, Parkinsons, etc) that prevent them from riding a DF bike, even if they wanted to. Much of the time there is no choice between a DF bike and a trike, just the choice between riding and not riding. I'd love to go back to my road bike, but it's not going to happen.
M Riley