The OP seems very confused. I think that with all the media attention, you are just now getting the information about the laws that have been around since 1985. They are not new, they are existing, and in fact there are no "new" laws at all.
There are a lot of people who have been overly confused by the court case and the reportage, I think. Since 1985, it has not and is not legal to do incalls, whether there is one sp or a dozen using the same place. Many many sps think that it is legal for one sp, but not if there are 2 or more. Not so. However, all the LE does is arrest the multiple person setups, so it looks like that is the law. LE could come and get one single sp, if they wanted to, but they just don't. Incalls are possible, but they aren't legal even tho the activity taking place (prostitution itself) is legal.
The court challenge and the decision by the court to throw out this and a couple of other laws is ONLY in Ontario. No matter what happens there, if the laws are replaced or not, it will still only apply to what happens in Ontario not BC, AB or MB.