If it has a good range and payload, and speed, they can give a decisive advantage to the army that has them. They can deploy troops in large numbers in any place in a short time.
Regarding the civilian use. If with time they have no more accidents than conventional airplanes, they could be really useful.
And who knows... Maybe in the future we will see big double decker airliners with similar characteristics. It would be nice, to see a jumbo taking off like a harrier
