My view is that it's not a simple topic and there are several aspects to consider. 1 - On moving in to hotel space, this is a natural progression when tracking all of the existing OTA's. Over time all of the third party players will broaden their capabilities into other markets, although all will be secondary to search engine powered travel platforms such as Google. From a customer perspective it makes sense to offer the AirBNB customer a hotel option when they need it rather than having them use an alternate path to a booking.
2 - The main objective is customer ownership. This will matter in the wars to come!
From the operator perspective more competition in the OTA space is not necessarily a bad thing and may allow operators to balance some of the stranglehold on booking costs as they look further across a broader third party platform that wants to compete.
3 - On displacement of demand, I'm sure there is a level of this, although when examining the current hotel build pipeline there has never been more hotels being built globally at any time. Based upon that sentiment and the feasibility study process that goes into planning for hotel developments clearly there is a view that the market looks positive globally despite broader competition. These hotels will also have to be filled once they come to market and some may fit the AirBNB channel model nicely.
4 - AirBNB vs Hotel offer two different types of experience. One is more challenging to the traveler or better suited to multiple travelers wanting to be together. The other is based upon a standard expectation of product and service and ease of utilization of the environment. In the case of AirBNB the guest cannot be fully certain of what to expect as a product and there will be a level of getting to know the environment within and without the accommodation. The hotel experience is a known entity based on industry standards regardless or brand or operator. The choice is circumstantial in my opinion. I will look at AirBNB for leisure or when I have the time to navigate the environment. Many guests struggle with hotel room lighting and TV controls. Do they really want to learn an area or suburb for the things they need when travelling?
5 - Regulation will play a greater role in the AirBNB offering. It is clear that the idea of temporarily renting a residents property while out of town has skewed way past everyone's original thoughts. Naturally the socio-economic impact will continue to be scrutinized by governments based upon the impact of residential housing in municipalities. Visitors don't vote. The hotel sector will not be faced with these challenges.
6 - The the hotel sector is their own worst enemy as it pursues the ongoing commoditization of the experience. Less hospitality and more lodging. My view is that as the industry continues to pursue this approach they play directly into the hands of AirBNB where it's all product and no service. Hospitality needs to be more focused than ever on the service aspects as the differentiation from the AirBNB model. This is where the unmatched value can be applied.
7 - Commercially unless it is home sharing my experience has been that the price variance between AirBNB and traditional hotels is not distinct, particularly in popular markets. By the time AirBNB adds all of the additional charges and removes the facility and service aspects of a 'stay' there isn't much price difference at all.