There's a market for overpriced status goods. They have to work right basically 100% of the time, or the market doesn't ever appear. Segway works, unless the passenger is a bit too heavy, or (in the case of a good sized chunk of the US population) experiences actual weather, like sudden downpours, ice storms, icy roads...
There's a market for cargo / parcel delivery by drone, but unless it runs someone down or falls out of the sky onto someone's head, no one cares if the package gets destroyed, there's more where that came from.
You’re not paying attention. This isn’t an overpriced status good. This is a way to finally get around having to hire guys with very expensive drivers licenses. Ridiculous medallion fees. No more susceptibility to strikes. No more having to worry about sleep regulations.
And they don’t have to work 100% of the time. They just have to work 1% of the time MORE than people. Segway failed because it was a $5000 solution to a $100 problem. Self driving cars will work because in the end they’ll be CHEAPER. NYC cab medallions cost a couple hundred grand, have cost as much as a million. How expensive can a self driving car be and STILL come in less than that?