You'd think this would be relatively easy for DJI to implement. Just add the same sensor used underneath the aircraft to the end of each arm. The software for the optical flow sensor could be patched to allow for a proximity distance to be set for each sensor providing a soft wall through which...
gogowanda's pics make me wonder when some enterprising soul will make props and shrouds and convert the Inspire to a ducted fan. Safety and improved efficiency in one package. Would also help by decreasing the overall size of the craft.