We got rid of three-wheelers back in the day for one very obvious reason: they're dangerous as all hell.
The inherent instability of three wheels, with a lone wheel in the front, combined with high horsepower and torque from two- and four-stroke motors, meant a lot of people ended up in the hospital. And, after a host of accidents, crashes, and public calls for banning the machines, nearly every manufacturer stopped making them.
