The democratization of services that were previously so safe guarded is at the heart of the opposition, as regulators attempt to protect the unions and companies that have dominated the markets for transportation and accommodation, respectively.
Instead of finding ways to work together with companies in the sharing economy, many local government officials support the significant reduction in the number of options available to consumers by hindering the growth and expansion of Uber (as well as competitors such as Lyft and Sidecar) and Airbnb in their cities.
What politicians, unions, and regulators must accept is that the sharing economy is permanent. Attempting to ban it isn't a viable option. Consumers have had a taste of a wider range of transportation and travel accommodation options and prices, and, not surprisingly, they've embraced it.