Bitcoins are currently at $45k, so I guess this would mostly just be an issue at a luxury car place, which... should probably prepare to handle these types of transactions I guess. But that's not like Grandpa's Little Old General Store, so I bet they can handle it.

I'm actually curious how this will be implemented specifically. I guess (although I'm not well-informed on the ecosystem) that most of the places that let you do small cryptocoin transaction either use some smaller coin, or they must have some way of doing fractions of a bitcoin, right? In which case, the fraction system would have to be proprietary, I guess? I can't imagine the law required shopkeepers to use any particular proprietary exchange...