The BMI chart maxes out healthy weights at 192. So unless you have two NBA players or something, it should work well for most but perhaps not all healthy people.
>Men: 195.7 pounds
>Women: 168.5 pounds
So this could carry an average man, average woman, and under 36 pounds. At that point, the weight of your clothing or a bottle of wine becomes very important.
but that still implies a 100m person market, just in the USA, and people in other developed countries tend to be closer to the "healthy" range. There are lots of healthy people out there.
In short, I don't think this will be the make-or-break for flying cars...
No, not really. Only extremely wealthy people can buy this. It's more like a 10,000 to 100,000 person market in the US I would guess.