I'm not sure they would need to be accounted for. I think opposition to AirBNBs is a product of severe housing scarcity* and in a scenario where housing is abundant and rents are low, people would be much more welcoming of AirBNBs.
* (Or in some places like Kyoto and Venice, it's due to over-tourism complaints, but I don't think anywhere in Canada is struggling with that problem.)