I own three electric motorcycles and respectfully disagree. You can't make tube and canvas that let a passenger survive getting t-boned by a Yukon Denali or an F-250. One high-profile accident with a mother and her child getting peeled off the road with a coal shovel are all it'll take to kill such a form factor forever.
The problem isn't the form factor you're describing, it's that you can't put those on the road with 1000+ horsepower machines that are 50 times heavier. And on top of that, a lot of people just don't want to give up their heated massage seats and connected infotainment and removable third row or whatever crap they pack in minivans these days.
The elements of the form factor implied here are already on the road. Series hybrid bikes exist today. Fully faired bikes exist today. A fully feared tricycle recumbent could get you to work, clean and dry, on a dimes worth of energy. Cities like Barcelona and Taipei that already move on gas scooters, would smell immensely better if e-bikes took over.
American pick up trucks with their butch looking front ends that kill a lot of children are a stupid idea under any circumstances. But evidently we have to live with that death and destruction until they rust out. Kids are already dying because of the stupidity and we have not got what it takes to stop it. It means other places will benefit from better mobility sooner.
A fully feared tricycle recumbent will get you killed in a city with poor bike-ability. I have friends that have been in the hospital for weeks because of bike accidents in SF and NYC, which are arguably the exact kinds of places where you'd want bikes to replace cars. But instead, we have "Vision Zero" projects that still have staggeringly far to go.
I don't disagree with you: it would be great if we could replace more cars with bikes, but the reality is that there's almost nothing serious we can do in the US to undo the omnipresence of massive vehicles in most cities.
The problem isn't the form factor you're describing, it's that you can't put those on the road with 1000+ horsepower machines that are 50 times heavier. And on top of that, a lot of people just don't want to give up their heated massage seats and connected infotainment and removable third row or whatever crap they pack in minivans these days.