I think you've got this a bit turned around. KW, Re/Max, etc, they don't WANT the MLS out of the way. They ARE the MLS. The MLS is the database of the Realtor association. It's just a tool that the Realtors and Brokers use to market the properties to other Realtors and Brokers, and sometimes to the public as well.

Zillow makes money by selling placement on the listings to other agents. Many Realtors really dislike Zillow because of this ("This is MY listing and they are putting someone else's name on it, taking 3% away from me.").