in theory it could avoid car crashes in practice the dudes that buy these cars will probably cause more crashes;)
idk about the safety of involving jumping cars into car crashes, I'd still prefer the brakes (obviously not always enough time). The one useful situation I could see is if you're driving (accidentally I hope) off a cliff.
At least the fans will allow for really short breaking distances.
I historically argued for a sort of horror-vehicle that would achieve autonomous driving "early" by exploiting downforce from powerful fans, but I mostly imagined it being used for autonomous deliveries and never imagined there being people inside it.