Not to be prejudicial but my first instinct says that if Vancouver realtors don't like a new regulation, it's probably a good regulation. Outside of Hollywood and professional sports, realtors have to be the most grossly overpaid people on Earth. 

In a normal market, a realtor is supposed to *sell* houses, as in be a salesman, inform and persuade people, represent the seller. In Vancouver, Realtors are doing nothing more than tossing paperwork back and forth between people who are paying millions of dollars for the bits of land underneath houses, house in which buyers never intend to live in many cases.