I do not know how they could enforce that kind of law.
If they had that in the contract when you get a business license, then that might work. But the city doesn't have any way of forcing a business to stay in business. Adding this after a business has been operating for a while should not be permitted by any court.
If i was in SF, i would seriously decide if i wanted to stay, and be gone by the vote date.
Of course, i would choose to leave.
Comic U-Tuber's wife had SF hair stylist business. She got tired of picking up needles before opening each day. She left a couple years ago.