That's a great question. On the surface, most innovations seem like they come with no downside, but there is always usually a few. For starters, there isn't much room for error with a hover backpack. If I am hovering 15 feet in the air the backpack better have no malfunctions. Another downside could potentially be people getting even lazier. 

It will take a lot of testing for something like this to be available to the public, but soon enough we will all be able to obtain one!