The Schnee Dust Company already has a monopoly. They have no meaningful competition to get rid of. Still, as stated, I could see attempted war profiteering, engineering conflict to basically force people to buy their weapons. Of course, the shown competence of everyone besides Huntsmen leaves that plan a little bit to be desired, but hey, it wouldn't be the first time people have done stupid stuff like that.

Most Semblances work without Dust, and I doubt the Girmm will do anything differently either until they realize the humans aren't killing them as much, then they'll push all the harder.