Analysts say hotels are wise to experiment. Airbnb now has 5 million listings on its site, up 25 percent from a year ago. By comparison, Marriott grew 5 percent last year to 1.3 million rooms. In some markets, like New York and Miami, studies indicate that home-sharing is already eroding hotel profits.

But it’s not yet clear how far hotels are willing to expand into home-sharing, which challenges their traditional business models. It costs more to clean homes scattered in various neighborhoods than rooms at a central location, for example.

Why it matters: As hotels continue to experiment, the pressure from home-sharing sites isn’t going away. In fact, Airbnb is making hotel-like moves of its own.