I personally think it could be a great alternative to cars and bikes for those who need to take a whole family somewhere or a decent amount of stuff.
Only modifications I would make would be ride-by-wire and an extra set of pedals (so you can have two people pedalling without the annoyance of normal tandem bikes having to pedal at the same rate), and a more powerful motor (only 250W is legal in France, where this was designed, whereas 500W is legal here in Canada)
My problem would be how thrown together this looks. Cars are sleak, comfortable and safe(ish) - this looks like something someone threw together in a Thai chopshop to carry tourists around.
This is how a car without its body looks like. This is pure functional skeleton. There are projects that propose fairing for bikes which add weight but increase aerodynamics.
That's a whole world to invent. Not sure you want doors on something that doesn't go much faster than 20km/h but maybe you do and it is a good idea.