a widely usable 'jetpack' would actually be more like a ducted-fan coaxial octocopter that you wear, with flight stabilization/onboard flight controller not very dissimilar from a large commerical cinema filming octocopter.
if it relies on the person's skill to fly it and has a 5-10 minute max flight time, of course it'll be a niche thing...
Theoretically, if you could add adjustable mechanical joints, you could hook up a flight controller to it and fly it. Could you add the necessary joints and motivators and stay inside a reasonable weight? Not so sure.
if it relies on the person's skill to fly it and has a 5-10 minute max flight time, of course it'll be a niche thing...