This doesn’t surprise me much. There is a massive industry built around Arbitron’s audience measurement and changing that is daunting for all traditional Radio operators.
From what I understand, there is a similar situation going on between Nielsen, Broadcast television and Cable. Cable operators, like Pure-Play Internet radio stations, want equal audience measurement, but Nielsen’s bond to Broadcast television looks an awful like Arbitron’s bond with Radio.
I wonder how it will work out.