That's not a very good argument because the same thing can be said about the "5" passenger car. What do you do if 8 of you want to do something?
The solution is quiet simple though, use one of the "5" people's car that can seat that many or rent a car that can...
Oh and many commuter cars on the roadways are single occupancy vehicle which is why the government created ride share and car pool programs so these small cars are actually pretty practical in that sense.
But two cars is still better than 8 cars.
I don't see how you can see that 8 is better.
What are you going to do when your parents need you take them somewhere? Of you have to hual your t.v. around, etc etc... at the end of the day, or bring that big project into work, or bring your gym bag, you're taking that 4-5 seater car even though you're just toting yourself around... it's going to get as much use as a bicycle.
Grocery getting? Forget it.
Etc etc etc... like I said, not very pratical.
I remember there was a guy who needed help moving. He asked us over to bring our cars to help him move. He didn't have much...
And we were all saying to ourselves "don't he have a car?"
Then someone said "yeah, but it's a smart car"..
Then we was all like "oh....."
If smart car's haven't caught on, what makes you think these will?
These will probably be nothing more than... a toy folks buy to play around with... kinda like how the segway's ended up.
Or something someone buys for their daughter to drive to school becuase it's "cute".
And then after one accident where a person is killed, sales won't go anywhere. You can say it has all this and that safety devices all you want... but... that vs even a small compact... that person's going to die.