Kinda like the adoption of EANx?
Taking it logically I think DSMB could end up in SAR perhaps as an addition to the lift bag skill. Rescue maybe... The skill set related to marking a location of a missing diver or a search area... Maybe as a addition to the boat specialty, on more than one occasion I have had a live boat entry and then you shot a dsmb to signal pickup.
Maybe. I think in time a number of skills that are considered by PADI to be technical but which are being used more and more in the recreational community will have to find their way into the curriculum. Right now there is a lot of resistance. The sense seems to be that if divers want to learn about those things after they have taken their OW and AOW classes, they are free to do so as they gain personal experience.