They'll end up with a fraction of the range/payload of the old planes.
I know that paragliding and hang gliding exist, but those are a bit out of my comfort (and safety) zone.
https://en.wikipedia.org/wiki/Ikarus_C42
Technically it is a microlight but top speed and handling are much closer to a regular GA craft. I absolutely loved it and if my eyesight was better I'd definitely go for a license.