What, specifically, would the drone inspect? The only thing I can imagine a drone being useful for is inspecting the roof and chimney. And that's counting on the home inspector being too lazy too get on a ladder. In fact, most of them just use binoculars and call it a day. You really need a licensed professional who knows the local codes and is experienced enough to know what to look for. I don't see home inspections getting either fully or partially automated any time soon. The value-add just isn't there.