I think you underestimate the size of the "precariat" that feels it's on a trajectory towards becoming economically and culturally disenfranchised. The educated elites are quite disconnected with the population from the lower half of the "middle class" and downward. Look at what's happening in the Internet driven media of today. The lion's share of the volume online is outrage politics.
It's the young and economically squeezed vote you need to keep track of, both on the right and left. Trump and Sanders both knew this.
True. Not saying it can't happen. I just think it's unlikely. I think Johnson is currently polling somewhere around 10%? I guess the big hurdle will be getting in the debates like Perot did. Not sure what the current rules are for that.
It's the young and economically squeezed vote you need to keep track of, both on the right and left. Trump and Sanders both knew this.