Demand for steel jacketed ball may flatten out for the reason you describe, or due to the advancing age of the ammo. But with more Garands in the CMP pipeline, if anything I expect a bump up in demand for all flavors of .30-06 milsurp and commercial ammo that is marketed for the M1. AP M2 on the other hand is something different, and is not being made anymore. There is a ton of it out there too, so the price won't go up fast, but neither will it go down.