Perhaps its due to toy licencing on both ends considering Activision has also sold COD licence to Mega perhaps there is some legal things we don't know about. P.S. from someone who doesn't care about Destiny. With meh, from Rogue.
We can only hope, but maybe with Shadowkeep coming out there might be a renewal interest in the line. Having said that, my gut feeling is that it was Activisions influences and connections which drove the licensed Destiny merchandising train in the first place.