The video you posted is not unlike the current hoverboard being manufactured and it's completely impractical. All roads would have to be metallic.
I'm so hard pressed in my stance because the people both envisioning and actually making them, call them flying cars, with only 1 or 2 exceptions. Not to mention a dozen or so reputable news sources. Your stance against it is warrantless and pretty much pointless.
Other than for mild entertainment on the forum...
Just broke my personal record for number of consecutive days without dying!