After the long violent era of prohibition, and then the wayward and misguided war on drugs, I think the pressure against pipe tobacco would/will be through regulations and taxation, not prohibition per se. I think codger tub and bag tobacco would probably persist at states with ABC stores, or through some other state revenue stream, so as not to hand the whole market to the black market. The inconvenience and lack of appealing new blends and variety would whittle down the new customer base. If online sales is limited or eliminated, that would pare back the market. Pipe smoking might still be pleasant and possible for those who already know the ropes and could figure out access, but it wouldn't be appealing and fun, and so would dwindle. I could stretch my little stash 'til the eagle screams, but it would not be as interesting an activity. No pipesmagazine or Forums. No figuring out the sources of mystery pipes or where to get unicorn blends. No venting our rage until the mods show up. And so on. Puff-puff.