Being Government Agencies, and based on past experience with the psychology of such organizations, I can see the shotgun being done away with. They require regular training to remain competent, and are seen as a hold over from the past. Additionally, they kick and are harder for smaller statured males and pretty much all female officers to operate. When the transition to the AR is complete, the shotgun will fade from general use, like the revolver. The fact that they're more flexible, cheaper, safer in urban settings, and fill an entirely different niche will be discounted by bureaucrats many of whom have never held, fired or carried one. Once they "wear out" they'll be done.
