Market research has shown that older riders want 3 wheels...and newer riders appreciate the safety. And those who have no intention of ever owning a motorcycle said they are open to 3 wheels.
I read a nice article about this. I'll try and dig it up.
Every manufacturer is going to have a 3 wheeler...BRP is spending bazillions for the next gen Spyder.
And you know the question: what type of bike prevents high sides?!?