This is good news. If the US DoD needs Black Powder and the "little guy" can still buy some, it's a win. All the BP you will fire in your life most likely won't equal the BP used for maybe 1 shot from a Naval gun. Or even what's used in the ejection seats for 1 contract run of seats.
The govt can pull the plug on anything whenever it wants. If the Govt needs millions of tons of smokeless powder, guess who's not getting any? Guys like us.
However, the ATF is honestly not worried about guys like us shooting muskets and revolvers. There is already a limit on how much BP you can possess and they have better things to worry about than watching BP and Fertilizer sales. It is such a small risk matrix, to have them worry about pulling the plug on civilian Blackpowder sales. My friend asked me if I was worried about my state or the ATF putting restrictions on muzzleloaders, I'm like the ATF isn't trying to spend the manpower or $$ limiting and restricting cap and ball revolvers and muzzleloading rifles. It's the same reason pre-98 antiques require no paperwork, very few if any crimes are committed using these weapons. Never mind this stuff about Mexican cartels using Pietta brassers as drop guns. It's still such a drop in the bucket as far as the big picture.
ER Shaw in Pennsylvania makes or made all the barrels for the Colt M4's, and Bushmaster made (formerly) all the small parts. The govt has it's hands in everything.
I watched my PSG load his M9 Beretta once, guess what ammo he used? Not some magic USGI Lake City stuff, he had a box of the same American Eagle red box stuff you can buy at any sporting goods store. Our Designated Marksman rifles were box stock Springfield Armory Inc M1A's with plastic stocks. Nothing magical or produced in an arsenal. The same rifles you can buy. Same with Bushmaster. What rifles were civilian security personnel issued over in Iraq? You guessed it.....semi auto 16" Bushmasters. The Govt will reach out and purchase / acquire what it needs from anywhere it needs to.