Regardless of the actual costs, it's still a waste of energy to keep something hovering in the air when it can be moved over land as well: keeping something flo

Regardless of the actual costs, it's still a waste of energy to keep something hovering in the air when it can be moved over land as well: keeping something floating in the air will always require active power, whereas keeping it on the ground can be done passively (a spring/suspension system). If we're serious about surviving the next 100 years, frivolous energy expenditure is not the way to go.