This is the first legitimate excuse and the one that could cause the most political problems. That is tough to do, but it has been done over and over throughout this country in the last few years. The MLS systems now in place are known as proprietary systems. This means users must somehow connect their computer to the vendor's server in order to access the data residing on that server.
Open systems allow access via the Internet.
RIN tried to create a proprietary system. These companies took their lumps and moved on. These proprietary systems are outdated, inefficient, and doomed to failure. Just ask the Big Boys. However, there could be further justification for going to the Web.