What these personal air vehicles need is a reliable survivable lifeguard system which works every time, like fighter aircraft have zero-zero ejector seats (zero mph, zero altitude).
It doesn't matter how good/efficient/practical they are, Until someone can reliably survive a mechanical/power failure in a personal air vehicle they're not going to be a viable option. A motorbike can be fallen off with survivable injuries, a Paramotor can just glide to the ground, but anything without the ability to reach teh ground in a controlled manner without power after, for example, a bird strike would survive the incident just like airships didn't after the Hindenburg and similar lighter-than-air incidents.
Off the top of my head, some kind of deployable air-cushion bodybag/ram-air airfoil system combination...?