You're right, Phil, so let me correct my earlier statement: For a number of years there have been "members of the BoD" who sought to combine CSR and DSR. My first personal experience with this was at Heartland Park when a certain venerable BoD member from Florida tapped me on the shoulder while I was congratulating Mark Jaremko on his silver medal in CSR (earned in his DSR) to ask rhetorically, "Now Stan, tell me again why we can't combine CSR and DSR?" There have been others, as well.
In the spirit of full disclosure, during my time on the CRB I floated that idea a time or two, but there was no burning need and no one in either class wanted to do it. Personally, I concede that one could simply merge the two classes now at their respective displacement/weights and be done with it. At the Runoffs level there is nothing to distinguish their performance.