Driving rates are pretty low in HK and Macau because the cost of car ownership is so high (namely, the cost of a parking space) and public transit/taxis are so good. So I don’t think you’d get much pushback from actual drivers.
The taxis, logistics and trucking industries do have political clout, though, and they will be the ones pushing back.
At this rate, they might as well force all the people in HK to Speak Mandarin, Write in Simplified Chinese. Or get rid of them all together if they don't comply. Oh there is a word for it, Genocide.