Its my understanding that the Triads keep most of the purer heroin in China, and I am unsure if any Golden Triangle Heroin has been sent in large quantity to the US in years. I would guess that that SEA heroin won't go away anytime soon, as I wouldn't be surprised if the Triads liked to keep the better quality shit available for their own people while sending the fent, zenes, and whatever the fuck else to the America. Besides, that ultra potent shit is just more economically viable for them to send overseas. SEA heroin probably just probably won't have any significant presence stateside, and if it does, it'll probably get cut to shit anyways. I don't think the forseeable production drop from the Afghan producers would impact American heroin markets much either since a lot of that goes into Europe. I can forsee SEA heroin start making its way to Europe more to replace Afghani heroin though, but Europe is starting to have a fent/zene problem too, so they may just be fucked soon too. If anyone will bring more real heroin into the states, my guess is it will be Mexican cartels growing and processing it. They pretty much are the biggest drug suppliers to the US, and they already have a history of poppy cultivation and heroin manufacturing in the recent past, so I imagine they could start increasing production fairly easily if they wanted to. The Sinaloa Cartel recently had a bit of a PR campaign where they are claiming to ban fentanyl and start producing heroin again instead, so maybe we might see a return of somewhat real heroin in the coming future due to that (provided that they intend to follow through with this).