The future is here. The future is now. The future is HOVER UMP. (Original video via @JHUBaseball):
Can't imagine we'll see this become regular, but it's good work if you can get it. Also, John Hopkins University Baseball clarified that Hover Ump wasn't actually umpiring in the video:
FOR CLARIFICATION: umpire in hoverboard video was instructing high school umpires during an interaquad scrimmage. He was not umpiring.— JHU Baseball (@JHUBaseball) February 24, 2016
We can always dream, though.