Agreed.
Adding to that, I'd say that a big part of how "monetizing labour" compares to "monetizing capital" is, in simple terms, that monetizing capital (homes) has more too to maneuver. Ironically, labour (drivers) is the more commodified market.
Uber is a market maker in a world with hard price competition on both ends: drivers and passengers.
Since "rentals" is more variable, a 5-10% change in price/cost/income is tolerable. You can redecorate a rental, for example, to affect its value. Seasonality can shift price by a lot. Etc. This generally lends better to a thick, market-liberal layer.
It's a slight irony (again) that this is the end point. Airbnb was innovative. It changed my travel habits immediately. But, conceptually it's just a holiday rentals site. Nothing new apart from quality and scale. One rental's ROI will be very different from another's. One consumer's choice will be very different from another's. It's a differentiation market. Diverse product, flexible prices.
For an Uber customer/contactor, both the app and the drivers are commodities. What Uber probably needs to do is ruthless efficiency, low marginal costs. Not many SV-startup style companies have that mentality, so hard road ahead.
Also, being capital-oriented, Airbnb gets better over the long term. At this stage, much of Airbnb's stock comprises properties bought or leased specifically to be an Airbnb business.