It still has to be a law written by congress about it. Also, very high odds small sellers will be excluded. Some models show ebay and amazon collecting and distributing the funds.
It will be a while still. Literally will take an act of congress.
If it does happen I would assume for those old enough and around to remember in the US. The 1099k law for 200 & 20k transactions I want to say took about 3-4 years before it took effect.