Strongly disagree. As an Airbnb host (I rent out my master suite on Airbnb), there simply wasn't a site where I could do that before. Craigslist? Forget it--spam heaven, and no calendar or payment system. And VRBO has always been designed for "vacation homes", not "rent a single bedroom in a house you occupy" (which is why I use Airbnb.)
I live in Austin, and Austin has responded to Airbnb by making hosts pay hotel tax, and requiring us to register with the city. While an inconvenience, I'd rather do that than not be able to make extra income renting out the room. I hope San Francisco can do something similar (and I really hope Airbnb builds this into their site so I can stop filing paperwork and mailing paper checks every quarter!)