It's already underway. Some of the biggest sellers, including APC in the UK, have stopped dealing with individual customers. You have to prove you have a legitimate business reason to buy the stuff.
I don't know the exact state of affairs in the US, but it's not getting easier. Online meto is harder to find, too, or at least it's harder to see from an American ip address.
There's a way around every restriction, but it's hard to photoshop a convincing license for an industrial poison when you're already suicidally depressed. Which, from where these companies sit, is the whole point. As soon as Phil Nitschke started hyping SN, its days as an easily accessible tool were numbered. He's all but admitted that himself.