Three wheelers fall in between cars and bikes and will therefor have an even smaller market appeal.
You can look at a glass as half full or half empty. You could say three-wheelers come short to "real" cars and short to motorcycles if you only looked at *some* factors. If you look at others picture could be exactly the opposite. This is why it is important how you look at these three-wheelers.
Are they lesser cars or better motorcycles?
In my view, the answer depend's on visuals and their basic configuration. If it has two wheels in front and only one in back then it looks much like a lesser car and immediately you start to look for what it does not have, how it is worse than a car. A negative approach that is bound to fail, you wont like such vehicles.
But if it only has one wheel in front and two in the back and it looks more like a bigger motorcycle, you can easier see why and how it really is also better than ordinary motorcycle.
It gives you much the same maneuverability and "easy-to-park-ness" , but it also gives you roof, steel cage around you, doesn't demand wearing a helmet and special leather suit, it protects you from rain, wind, cold and heat etc, can be driven much bigger part of the year (if not the whole year because of snow and ice on the roads)
I see such three wheelers as a fusion of strengths of both 4 and 2 wheeled worlds. It comes with some compromises but gives much in return. Three wheelers should not try to imitate cars, they should try to improve ordinary bikes. That is also why a motorcycle company has bigger chances with success in such vehicle than a car company does. People will easier look at them as a better motorcycles.
"GM builds cars so this has to be some odd car. I don't like it, it is so small and unsafe!".
"Kawasaki only builds motorcycles. Hmmm now this one here looks like interesting and useful one. It has roof!".
I cannot wait to be able to buy something like that CarverOne or VentureOne. The only thing I miss on them is another door on the right side. Make it a two-door and add some nice and useful interior.
You don't have to appeal to 100 millions of potential buyers to sell 1.000 per year. Carver only built like 100 per year and now says they will concentrate on engineering. But still they've sold them for like 70 thousand dollars a piece.
Sure, but not in great enough numbers to make a difference.
What difference? I couldn't care less for making a difference.
I just know what I want to buy but there is no-one willing to sell it to me.