You neglect to mention the probable drastic increase in fuel economy. As to who will work on them--they ARE powered by internal combustion and have wheels--so any decent auto mechanic will be qualified to "work on these things".
Looks like a perfect vehicle for the daily commute.
It won't be as easy to obtain a mechanic who feels like wrestling with the idiosyncracies of these trikes as you think.
Thanks, but I'll stick with a traditional motorcycle for fuel-efficient, zippy commuter transportation on days when I don't feel like taking the train or a car. They'll need to sink LOTS more engineering brainpower into this concept before it really makes sense.
~ Blue Jays ~