And I'm not sure how I feel about the fact that this would kind of limit use to young, single, healthy people. People with disabilities or medical issues, families trips with kids plus grandparents, or even just older or more introverted people that don't want the hostel vibe may want or need more privacy than a shared unit.
The other thing that gets overlooked is the flexibility AirBnB provides in the gray area between living somewhere and visiting - one can book an airbnb for a few weeks, pick up and move to a new city with no belongings, and look for a job while deciding whether to move there for longer. Or find a place to live for a short internship. People are doing this anyway via sketchy craigslist sublets, but it's a lot safer (I'm just assuming in terms of physical safety, but certainly in terms of avoiding scams) on a platform like AirBnB.
Overall, I'm disappointed that cities are not at least looking at the popularity of AirBnB and, say, creating a new kind of zoning/licensing to officially allow some small percentage of AirBnB units, or allowing some hotel zoning & construction to be added to the fun residential neighborhoods where people want to live & stay. Or encouraging more subletting type rentals (every lease I've ever been on forbids it).
If they were doing anything at all to acknowledge that AirBnB is providing something that a lot of people really want and allowing some aspects of that to flourish, I could get more behind these regulations to limit unlicensed rentals.