This Radio World article talks about the NRSC and their "impact". How about they check-out the impact of allowing DRM on MW in the USA?
In fact, this BBC study on Project Mayflower might just tell them what they need to know. Even at modest power levels, DRM works well and sounds better than AM!
This is one of many documents that plead our case - that DRM is the digital solution for the mediumwave and shortwave bands.
Let Radio World know what you think about DRM! Perhaps the FCC and NRSC will get the picture and allow DRM to be tested head-to-head with IBOC on the AM/MW broadcast band.