One thing about the US government, is its slow. It will take a while to even get legislation drafted, let alone passed. We will all be well aware of an impending ban, and this should give you plenty of time to set aside a large stock of MHRB for future use. A small investment would get you a couple kilos worth. I cant imagine a single person using the spice responsibly burning through that much MHRB in a lifetime.

I do believe eqt146's concern was that there's no legislation needed for high percentage of shipments to be seized. One example in UK. First time I hear about Canada myself.