Nice article, but I don't think it's anything to get hung up about.
1) Politicians are quaking in their boots right now and are really trying hard to lie and cheat their way back into the public's good graces. Shoving stimulus packages, Healthcare Bills, and then putting off the Bush tax cuts til after the election has got a hornets nest stirred up, and they know it. If they go after guns (or powder) now I think they know there'd be an unimaginable backlash of pissed off people. One of those 'final straw' sorta deals.
2) No 'smokeless' powder and "No gunpowder" are two different things
3) Even if gunpowder suddenly evaporated from the planet, a determined bunch of people could find many other ways of waging war or defending ones self. I swear if guns are ever banned I'll start carrying a loaded crossbow with me to the grocery store. Now THATS open carry.