Tim mentioned to me yesterday that he was working on an "idea" related to your suggestion. He did not elaborate on this idea and also mentioned, of course, that the "idea" had to be approved by others (Pawson I am sure). So lets see what they come up with. I seriously do not beleive that they would ever retire the entire quantity of Perf A but I can see the retirement of a great portion of them. I have a feeling that Pawson would never give up that much control.
Opinions expressed are solely my own and any who reads should perform their own DD and not listen to me cause I change my mind frequently and sometimes for no apparent reason.